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Tytuł:
A new confidence interval for the odds ratio
Autorzy:
Zielińska-Kolasińska, Zofia
Zieliński, Wojciech
Powiązania:
https://bibliotekanauki.pl/articles/14785942.pdf
Data publikacji:
2023-03-15
Wydawca:
Główny Urząd Statystyczny
Tematy:
confidence interval
odds ratio
Opis:
We consider the problem of interval estimation of the odds ratio. An asymptotic confidence interval is widely applied in economics, medicine, sociology, etc. Unfortunately, this confidence interval has a poor coverage probability, significantly smaller than the nominal confidence level. In this paper, a new confidence interval is proposed. Its construction requires only information on the sizes of samples and the sample odds ratio. The coverage probability of the proposed confidence interval is at least the nominal confidence level.
Źródło:
Statistics in Transition new series; 2023, 24, 2; 113-128
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of Logistic Regression for Firms Survival Analysis
Zastosowanie regresji logistycznej do analizy szansy przetrwania firm
Autorzy:
Markowicz, Iwona
Solorz, Beata
Powiązania:
https://bibliotekanauki.pl/articles/906309.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
logistic regression
odds ratio
encoding, firms
Opis:
Lata 90-te XX w. w Polsce to okres rozwoju przedsiębiorczości. Swoboda zakładania i prowadzenia działalności gospodarczej przyczyniła się do powstawania nowych, głównie małych, firm. Nie wszystkim przedsiębiorcom udaje się jednak utrzymać działalność w dłuższym czasie. Celem artykułu jest analiza szansy przetrwania firmy przez określony czas oraz różnic dla firm założonych w różnych latach. Zastosowano model regresji logistycznej dla dychotomicznej zmiennej zależnej. W artykule przedstawiono wyniki etapu badań prowadzonych w ramach projektu badawczego MNiSW N 111 011 31/1109.
The 90's of the 20th century in Poland it's a period of economic development. Freedom o f establishing and carrying on a business caused rising many new, mostly small firms. Yet not all entrepreneurs were able to run their businesses for a longer period of time. The purpose of the paper is to analysis firms survival chance in a determined period o f time and to analysis differences between firms established in different years. Logistic regression model for dichotomous dependent variable will be used.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2009, 228
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulmonary function of jute mill workers from West Bengal, India
Autorzy:
Mandal(Majee), A.
Majumder, R.
Powiązania:
https://bibliotekanauki.pl/articles/1914021.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Medyczny w Białymstoku
Tematy:
pulmonary function
jute workers restrictive/obstructive respiratory symptoms
odds ratio
Opis:
Background: Jute industry workers constantly exposed themselves to jute dust and are at risk of impairment of lung function. Investigation on various studies revealed the effects of exposure to jute dust but limited studies so far undertaken regarding its bearing on pulmonary function of jute workers of West Bengal,India. Purpose: To evaluate the respiratory status of jute mill workers of West Bengal exposed to occupational hazards. Materials and Methods: This cross sectional study was conducted on 203 male jute mill workers of age range 18 – 60 yrs. from West Bengal and a control group of 141 men of similar age .Dynamic pulmonary function parameters were carried out including physical parameters, respiratory abnormalities, year of exposure and smoking history. Results: FVC, FEV1, FEF 200-1200 and PEFR values of higher age group non smoker of low dust zone were significantly higher in comparison to the non smoker of high dust zone. The prevalence of chest tightness was 33.49% and liver dysfunction was 41.9% in dusty zone workers of jute mill in comparison to less dusty zone. Again, incidence of chest tightness and cough was highest (35.44%) in higher age group workers and prevalence of byssinosis like symptoms and chronic bronchitis was 30- 37% after 10 – 30years of exposure. But occurrence of bronchial asthma was 11.9% in workers of greater than 20 years of exposure. Prevalence of all the above respiratory abnormalities was higher among smokers than non-smokers. Conclusions: Concentration of jute dust exposure had been associated with decrease in FVC, FEV1, and PEFR with a higher risk of developing chronic bronchitis, bronchial asthma, byssinosis and other respiratory symptoms. This indicated high occupational health hazards which would create an alarming situation, if remained unchecked.
Źródło:
Progress in Health Sciences; 2014, 4, 1; 7-17
2083-1617
Pojawia się w:
Progress in Health Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modifiable lifestyle factors and ovarian cancer incidence in women
Autorzy:
Plagens-Rotman, K.
Chmaj-Wierzchowska, K.
Pieta, B.
Bojar, I.
Powiązania:
https://bibliotekanauki.pl/articles/2081558.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
ovarian cancer
risk factors
lifestyle
the odds ratio
disease
Opis:
Introduction. A correct diet plays an important role in the prevention of malignant tumours. The risk of the disease may be reduced by introducing a number of changes to the daily diet. The most important changes concern the amount of fat in the diet, dietary fibre, antioxidants in the food and the reduction of substances having a significant impact on the development of malignant tumours. Objective. The aim of the study is to analyse the role of selected modifiable lifestyle factors affecting the development of ovarian cancer. Materials and method. The study covered healthy women and women with diagnosed ovarian cancer. A total of 850 women aged between 21–84 were studied. The study included women visiting the Gynaecology and Obstetrics Hospital of the University of Medical Sciences in Poznan, Poland, between 2011–2013. Patients recognized with malignant ovarian cancer were qualified into the study based on the histopathological examination of the material obtained during surgery. Results. Respondents who consumed fruit and vegetables several times a week have the odds ratio OR = 0.29 level; 95% CI 0.04–2.01 (p =.2085), compared to women not consuming fruit and vegetables at all. Consumption of 100 g of French fries and potato chips several times a week, results in a 2-fold increase in ovarian cancer. The OR for this group of women amounts to 2.06; 95% CI 0.53–7.99 (p=.2966). Conclusions. A diet rich in fruit and vegetables, including bulb vegetables, and grain products containing whole grains, should be introduced. It is recommended that the consumption of popular fast foods be eliminated.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 1; 36-40
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of socio-demographic factors on the breastfeeding period of women in Bangladesh: a polytomous logistic regression model
Autorzy:
Islam, Masudul
Afroja, Sohani
Biswas, Animesh
Khan, Md. Salauddin
Khandker, Sara
Powiązania:
https://bibliotekanauki.pl/articles/551863.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
chi-square distribution
logistic models
breastfeeding
milk
Bangladesh
odds ratio
Opis:
Background. In Bangladesh, terrible degradation in the breastfeeding period has occurred with rapid urbanization in recent years that is causing a shortage of child nourishment. Identifying the risk factors of breastfeeding duration is important for planning nutritional programs and strategies. Objectives. This study tries to identify influential demographic and socio-economic factors that affect the breastfeeding period for reducing child nutrition deficiency. Material and methods. The study attempts to proceed with data collected from an observational study entitled the Bangladesh Demographic and Health Survey (BDHS) 2014. The breastfeeding period (Ordinal exogenous variable) is classified into three groups: 0–5-months, 6–23 months and at least 24 months. Gamma, chi-square and linear-by-linear statistics are used to identify the associated factors that have an impact on the breastfeeding period. A test of parallelism is conducted to evaluate the proportional odds. The polytomous logistic regression (PLR) model and the proportional odds (PO) model are used to find the marginal effect of demographic and socio-economic predictors that affect the breastfeeding period. Results. Parental educational attainment, wealth index, division, religion, mother’s BMI, drinking water source, household members, amenorrhea and abstaining, respectively, are the most significant factors that influence the breastfeeding period. The PLR model is also more precise than the PO model for indicating the marginal effect among those vital factors for the breastfeeding period. Conclusions. PLR is an appropriate model to recognize the effect of predictors of breastfeeding duration instead of the PO model and other measures.
Źródło:
Family Medicine & Primary Care Review; 2019, 3; 223-229
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Information inequalities for the minimax risk of sequential estimators (with applications)
Autorzy:
Gajek, Lesław
Mizera-Florczak, B.
Powiązania:
https://bibliotekanauki.pl/articles/1339084.pdf
Data publikacji:
1998
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
odds ratio
information inequalities
censored data
minimax estimation
proportional hazard model
Opis:
Information inequalities for the minimax risk of sequential estimators are derived in the case where the loss is measured by the squared error of estimation plus a linear functional of the number of observations. The results are applied to construct minimax sequential estimators of: the failure rate in an exponential model with censored data, the expected proportion of uncensored observations in the proportional hazards model, the odds ratio in a binomial distribution and the expectation of exponential type random variables.
Źródło:
Applicationes Mathematicae; 1998-1999, 25, 1; 85-100
1233-7234
Pojawia się w:
Applicationes Mathematicae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of chained two-point clusters for the examination of associations of air pollution with health conditions
Autorzy:
Szyszkowicz, Mieczysław
Burr, Wesley S.
Powiązania:
https://bibliotekanauki.pl/articles/2177423.pdf
Data publikacji:
2016-05-25
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
ambient air pollution
Mortality
case-crossover
cluster
relative risk
odds ratio
Opis:
Objectives There are a few accepted and intensively applied statistical methods used to study associations of ambient air pollution with health conditions. Among the most popular methods applied to assess short term air health effects are case-crossover (using events) and time-series methodologies (using counts). A few other techniques for studying counts of events have been proposed, including the Generalized Linear Mixed Models (GLMM). One suggested GLMM technique uses cluster structures based on natural embedded hierarchies: days are nested in the days of a week (dow), which, in turn, are nested in months and months in years (< dow, month, years >). Material and Methods In this study the authors considered clusters with hierarchical structures in a form of < dow, 14-days, year >, where the 14-days hierarchy determines 7 clusters composed of 2 days (the same days) of a week (2 Mondays, 2 Tuesdays, etc.), in 1 year. In this work the authors proposed hierarchical chained clusters in which 2 days of a week are grouped as follows: (first, second), (second, third), (third, fourth) and so on. Such an approach allows determination of an additional series of the slopes on the clusters (second, third), (fourth, fifth), etc., i.e., estimation of the coefficients for other configurations of air pollutant levels. The authors considered a series of 2 point chained clusters covering a year. In such a construction each cluster has one common data point (day) with another one. Results The authors estimated coefficients (slopes) related to the ambient ozone exposure (mortality) and to 3 selected air pollutants (particulate matter, nitrogen dioxide and ozone) combined into index and considered as health risk exposure (emergency department (ED) visits). The generated results were compared to the estimations obtained from the time-series method and the time-stratified case-crossover method applied to the same data. Conclusions The proposed statistical method, based on the chained hierarchical clusters (< dow, 14-days, year >), generated results with shorter confidence intervals than the other methods.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2016, 29, 4; 613-622
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What is the association between post-traumatic stress disorder and unemployment after a disaster?
Autorzy:
Serrano, Carlos
Leiva-Bianchi, Marcelo
Ahumada, Francisco
Araque-Pinilla, Fernanda
Powiązania:
https://bibliotekanauki.pl/articles/2093865.pdf
Data publikacji:
2021-12-13
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
resiliency
psychosocial risk factors
odds ratio
unemployment
sex difference
post-traumatic stress disorder
Opis:
ObjectivesThe problem is to determine whether, after a disaster, unemployment is a possible cause of post-traumatic stress disorder (PTSD) – the classic model, or whether PTSD is a possible cause of unemployment – the alternative model.Material and MethodsThe study was conducted on a probabilistic sample of 26 213 adults who provided responses using the Davidson Trauma Scale and lived in regions near or far from the epicenter (Cobquecura, the coast of Chile) of the earthquake and tsunami of February 27, 2010.ResultsIndependent of the proximity to the epicenter, there is an association between PTSD, unemployment, female sex and the poverty line. For regions close to the epicenter, the alternative model has better adjustment indicators than the classic model.ConclusionsGiven the adjustment of the alternative model, the occurrence of PTSD cases is more likely to explain the unemployment condition.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2021, 34, 6; 755-766
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An approach to represent a combined exposure to air pollution
Autorzy:
Szyszkowicz, Mieczyslaw
Powiązania:
https://bibliotekanauki.pl/articles/2177164.pdf
Data publikacji:
2015-07-17
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
ambient air pollution
case-crossover
odds ratio
index
emergency department visit
air pollution
Opis:
Objectives The objective of this study was to present a technique for estimating the effect of ambient air pollution mix on health outcomes. Material and Methods We created a technique of indexing air pollution mix as a cause of the increased odds of health problems. As an illustrative example, we analyzed the impact of pollution on the frequency of emergency department (ED) visits due to colitis among young patients (age < 15 years, N = 11 110). Our technique involves 2 steps. First, we considered 6 ambient air pollutants (carbon monoxide, nitrogen dioxide, sulphur dioxide, ozone, and 2 measures of particulate matter) treating each pollutant as a single exposure. Odds ratios (ORs) for ED visits associated with a standard increase (interquartile range – IQR) in the pollutants levels were calculated using the case-crossover technique. The ORs and their 95% confidence intervals (95% CIs) were also found for lagged exposures (for lags 1–9 days). Second, we defined a Health Air Study Index (HASI) to represent the combined impact of the 6 air pollutants. Results We obtained positive and statistically significant results for individual air pollutants and among them the following estimations: OR = 1.06 (95% CI: 1.02–1.1, NO₂ lag 3, IQR = 12.8 ppb), OR = 1.04 (95% CI: 1.01–1.07, SO₂ lag 4, IQR = 2.3 ppb), OR = 1.04 (95% CI: 1–1.06, PM lag 3, IQR = 6.2 μg/m³). Among the re-calculated ORs with the HASI values as an exposure, the highest estimated value was OR = 1.37 (95% CI: 1.12–1.68, for 1 unit of the HASI, lag 3). Conclusions The proposed index (HASI) allows to confirm the pattern of associations for lags obtained for individual air pollutants. In the presented example the used index (HASI) indicates the strongest relation with the exposure lagged by 3 days.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2015, 28, 5; 823-830
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The risk of hearing loss associated with occupational exposure to organic solvents mixture with and without concurrent noise exposure: A systematic review and meta-analysis
Autorzy:
Hormozi, Maryam
Ansari-Moghaddam, Alireza
Mirzaei, Ramazan
Dehghan Haghighi, Javid
Eftekharian, Fatemeh
Powiązania:
https://bibliotekanauki.pl/articles/2161922.pdf
Data publikacji:
2017-06-19
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
odds ratio
occupational exposure
organic solvents
dose–response relationship
hearing loss
noise
Opis:
This study is a meta-analysis of the previous epidemiological studies which investigated the quantitative estimates of the association between independent or combined exposure to noise and mixed organic solvents and hearing loss until October 2014. Overall, 15 studies with information on 7530 individuals (6% female) were included. Having assessed – by puretone audiometry – the adjusted odds ratio estimates for the association between solvents mixture exposure and the risk of developing hearing loss stood at 2.05 (95% confidence interval (CI): 1.44–2.9). Similarly, for subjects who were concurrently exposed to noise and solvents mixture, an OR of 2.95 (95% CI: 2.1–4.17) was obtained. There was some evidence of heterogeneity within each of the 2 exposure groups (p heterogeneity < 0.001). This heterogeneity was not explained by differences in strength of effect between duration of exposure, the number of solvent and exposure index in subgroups of solvents mixture exposure. Based on the available data, our analysis has provided the evidence of increased risk of developing hearing loss for workers exposed to organic solvents even at quite low concentration. Moreover, if such exposure is accompanied by noise, it will exacerbate the extent of hearing loss. Int J Occup Med Environ Health 2017;30(4):521–535
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2017, 30, 4; 521-535
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
IS IT A BUSINESS FEEDING ON EMOTIONS OR AN ACT OF ALTRUISM? THE CASE OF FINANCING FOOTBALL IN POLAND
BIZNES WYKORZYSTUJĄCY EMOCJE CZY ALTRUIZM? PRZYPADEK FINANSOWANIA PIŁKI NOŻNEJ W POLSCE
Autorzy:
Majewski, Sebastian Mariusz
Powiązania:
https://bibliotekanauki.pl/articles/659267.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
piłka nożna
kursy bukmacherskie
emocje
modele typu ARCH
football
betting odds
emotions
ARCH type models
Opis:
W książce „Soccernomics” S. Szymanski i S. Kuper piszą o obalaniu popularnych mitów związanych z piłką nożną. Jednym z większych mitów, jak piszą autorzy, jest stwierdzenie, że  piłka nożna to wielki biznes. Jeżeli piłka nożna nie jest wielkim biznesem, to należy się zastanowić dlaczego skupia wokół siebie tak wielkie pieniądze – jak podaje raport Deloitte’a w 2014 r., przychody tylko 20 największych klubów na świecie najprawdopodobniej przekroczą 6 miliardów euro. Stąd pytanie, które postawiono w tym artykule – czy piłka nożna to biznes, który wykorzystuje emocje czy może kaprys altruistycznych biznesmenów?Celem artykułu jest weryfikacja hipotezy o behawioralnym charakterze związków między przedsiębiorstwami finansującymi kluby piłkarskie a klubami i sympatykami tych klubów. Analizie zostaną poddane spółki giełdowe, które są zaangażowane w finansowanie funkcjo-nowania klubów najwyższej ligi rozgrywkowej w Polsce – Ekstraklasy. W analizie były wykorzystywane kursy akcji następujących spółek giełdowych: Comarch, KGHM, Zakłady Chemiczne Police Grupa Azoty, Tauron, Energa i Lotos. Wśród tych spółek można wyróżnić dwie grupy: właścicieli klubów piłkarskich (Cracovia, Zagłębie Lubin) oraz sponsorów piłki nożnej (Pogoń Szczecin, Lechia Gdańsk, Śląsk Wrocław). Do badania zostaną użyte kursy akcji, wyniki sportowe klubów oraz prawdopodobieństwa bukmacherskie.
The main goal of this article is to verify the hypothesis on the behavioural character of the relationships between enterprises financing football in Poland and the fans of this sport. In his research, the author analyses selected companies listed on the Warsaw Stock Exchange which are engaged in financing football in the Polish Ekstraklasa. The author uses the quotations of such companies as: Ruch Chorzow, Comarch, KGHM, Tauron, Lotos and Police. It is possible to divide these companies into three groups: owners (Comarch, KGHM), sponsors (Tauron, Lotos, Police) and one public company (Ruch). In the research, ARCH models are used based on econometric models with independent variables: sporting results and betting odds.
Źródło:
Acta Universitatis Lodziensis. Folia Oeconomica; 2015, 1, 310
0208-6018
2353-7663
Pojawia się w:
Acta Universitatis Lodziensis. Folia Oeconomica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A refined and asymptotic analysis of optimal stopping problems of Bruss and Weber
Autorzy:
Louchard, Guy
Powiązania:
https://bibliotekanauki.pl/articles/748016.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Stopping times, Unied Approach to best choice, Odds-algorithm, Optimal solutions, x-Strategy, Asymptotic expansions, Incomplete information.
Opis:
Klasyczny problem sekretarki został uogólniony na przestrzeni lat w kilku kierunkach. W niniejszym artykule ograniczamy nasze zainteresowanie do tych uogólnień, które mają związek z bardziej ogólnym problemem zatrzymania na ostatniej obserwacji określonego rodzaju. Problemy Brussa-Webera, które rozważamy, koncentrują się wokół następującego modelu: Obserwowany jest ciąg niezależnych zmiennych losowych o tym samym rozkładzie przyjmujących trzy wartości: +1; -1; 0. Celem jest maksymalizacja prawdopodobieństwa zatrzymania na wartości +1 lub -1 pojawiającej się po raz ostatni w sekwencji. Badamy pokrewne problemy zarówno z czasem dyskretnym, jak i ciągłym, ze znaną lub nieznaną liczbą obserwacji oraz znanym  i nieznanym rozkładem. W szczególności bierze się pod uwagę tak zwaną strategię z niepełną informacją. Nowością w niniejszej pracy jest udoskonalona analiza kilku problemów w tej klasie oraz badanie asymptotycznego zachowania się rozwiązań. Prezentujemy również symulacje odpowiednich kompletnych algorytmów wyboru.
The classical secretary problem has been generalized over the years into several directions. In this paper we confine our interest to those generalizations which have to do with the more general problem of stopping on a last observation of a specific kind. The Bruss-Weber problems we consider center around the following model: Let X1;X2;... ;Xn be a sequence of independent and identically distributed random variables which can take three values: {+1;-1; 0}. The goal is to maximize the probability of stopping on a value +1 or -1 appearing for the last time in the sequence. We study related problems both in discrete and continuous time settings, with known or unknown number of observations, and known and unknown probability measure. In particular, so called x-strategy with incomplete information is taken into consideration. Our contribution in the present paper is a refined analysis of several problems in this class and a study of the asymptotic behaviour of solutions. We also present simulations of the corresponding complete selection algorithms.
Źródło:
Mathematica Applicanda; 2017, 45, 2
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Odds -theorem and monotonicity
Optymalne zatrzymywanie w oparciu o algorytm ilorazu szans a monotoniczność wartości problemu
Autorzy:
Bruss, F. Thomas
Powiązania:
https://bibliotekanauki.pl/articles/953406.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
Odds-algorithm
Secretary problem
Selection criteria
Multiple stopping problems
Group interviews
Games
Clinical trial
Prophet inequality
Opis:
Given a finite sequence of events and a well-defined notion of events being interesting, the Odds-theorem (Bruss(2000)) gives an online strategy to stop on the last interesting event. This strategy is optimal for independent events, and it is obtained in a straightforward way by an algorithm which is optimal itself (odds-algorithm). Here we study questions in how far the optimal value mirrors monotonicity properties of the underlying sequence of probabilities of events. We make these questions precise, motivate them, and then give complete answers. The motivation is enhanced by certain problems where it seems desirable to apply the odds-algorithm but where a lack of information does not allow to do so without incorporating sequential estimation. In view of this goal, the notion of a plug-in odds-algorithm is introduced. Several applications are included.
Źródło:
Mathematica Applicanda; 2019, 47, 1
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exploring the use of syntactic dependency features for document-level sentiment classification
Autorzy:
Kalaivani, K. S.
Kuppuswami, S.
Powiązania:
https://bibliotekanauki.pl/articles/201609.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
document-level sentiment classification
syntactic dependency features
generalized dependency features
information gain
weighted frequency
weighted odds
zdobywanie informacji
częstotliwość
szanse
Opis:
An automatic analysis of product reviews requires deep understanding of the natural language text by machine. The limitation of bag-of-words (BoW) model is that a large amount of word relation information from the original sentence is lost and the word order is ignored. Higher-order-N-grams also fail to capture the long-range dependency relations and word order information. To address these issues, syntactic features extracted from the dependency relations can be used for machine learning based document-level sentiment classification. Generalization of syntactic dependency features and negation handling is used to achieve more accurate classification. Further to reduce the huge dimensionality of the feature space, feature selection methods based on information gain (IG) and weighted frequency and odds (WFO) are used. A supervised feature weighting scheme called delta term frequency-inverse document frequency (TF-IDF) is also employed to boost the importance of discriminative features using the observed uneven distribution of features between the two classes. Experimental results show the effectiveness of generalized syntactic dependency features over standard features for sentiment classification using Boolean multinomial naive Bayes (BMNB) classifier.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 339-347
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multiple stopping odds problem in Bernoulli Trials with random number of observations
Autorzy:
Kurushima, Aiko
Ano, Katsunori
Powiązania:
https://bibliotekanauki.pl/articles/747322.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Matematyczne
Tematy:
optimal stopping problem
selecting the last success
odds theorem
multiple stopping
Zagadnienie optymalnego zatrzymania
wybór ostatniego sukcesu
twierdzenie o względnych szansach
wielokrotne zatrzymywanie
Opis:
Praca poświęcona jest problemowi wielokrotnego, optymalnego zatrzymania ciągu prób Bernoulli'ego tak, aby zmaksymalizować prawdopodobieństwo wyboru ,,ostatniego sukcesu", gdy liczba prób jest zmienna losową. Podano warunki wystarczające na rozkład liczby obserwacji przy których spełnieniu strategia optymalna istnieje w klasie progowych momentów zatrzymania. Optymalne progi są definiowane z pomocą ,,ilorazów szans". Przykładem rozkładu, który należy do kasy spełniającej podane warunki jest rozkład jednostajny (ilorazy szans są nierosnące wraz z liczbą prób).
This paper studies an optimal multiple stopping problem, in which the objective is to maximize the probability of selecting the "last success" on Bernoulli trials with random number of observations under multiple selections. We propose the sufficient condition on the probability distribution of the number of observations for the optimal multiple stopping rule to be a threshold rule which is characterized by "odds". For example, uniform distribution satises the condition whenever the odd is not increasing in the number of trials.
Źródło:
Mathematica Applicanda; 2016, 44, 1
1730-2668
2299-4009
Pojawia się w:
Mathematica Applicanda
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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