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Wyświetlanie 1-10 z 21
Tytuł:
A new family of robust regression estimators utilizing robust regression tools and supplementary attributes
Autorzy:
Sajjad, Irsa
Hanif, Muhammad
Koyuncu, Nursel
Shahzad, Usman
Al-Noor, Nadia H.
Powiązania:
https://bibliotekanauki.pl/articles/1363609.pdf
Data publikacji:
2021-03-03
Wydawca:
Główny Urząd Statystyczny
Tematy:
percentage relative efficiency
Opis:
Zaman and Bulut (2018a) developed a class of estimators for a population mean utilising LMS robust regression and supplementary attributes. In this paper, a family of estimators is proposed, based on the adaptation of the estimators presented by Zaman (2019), followed by the introduction of a new family of regression-type estimators utilising robust regression tools (LAD, H-M, LMS, H-MM, Hampel-M, Tukey-M, LTS) and supplementary attributes. The mean square error expressions of the adapted and proposed families are determined through a general formula. The study demonstrates that the adapted class of the Zaman (2019) estimators is in every case more proficient than that of Zaman and Bulut (2018a). In addition, the proposed robust regression estimators based on robust regression tools and supplementary attributes are more efficient than those of Zaman and Bulut (2018a) and Zaman (2019).The theoretical findings are supported by real-life examples.
Źródło:
Statistics in Transition new series; 2021, 22, 1; 207-216
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unbiased estimator modeling in unrelated dichotomous randomized response
Autorzy:
Adediran, Adetola Adedamola
Adebola, Femi Barnabas
Ewemooje, Olusegun Sunday
Powiązania:
https://bibliotekanauki.pl/articles/1059019.pdf
Data publikacji:
2020-12-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
dichotomous
relative efficiency
sensitive attribute
Opis:
The unrelated design has been shown to improve the efficiency of a randomized response method and reduces respondents’ suspicion. In the light of this, the paper proposes a new Unrelated Randomized Response Model constructed by incorporating an unrelated question into the alternative unbiased estimator in the dichotomous randomized response model proposed by Ewemooje in 2019. An unbiased estimate and variance of the model are thus obtained. The variance of the proposed model decreases as the proportion of the sensitive attribute ?_A and the unrelated attribute ?_U increases, in contrast to the earlier Ewemooje model, whose variance increases as the proportion of the sensitive attribute increases. The relative efficiency of the proposed model over the earlier Ewemooje model decreases as ?_U increases when 0.1??_A? 0.3 and increases as ?_U increases when 0.35??_A? 0.45. Application of the proposed model also revealed its efficiency over the direct method in estimating the prevalence of examination malpractices among university students; the direct method gave an estimate of 19.0%, compared to the proposed method’s estimate of 23.0%. Hence, the proposed model is more efficient than the direct method and the earlier Ewemooje model as the proportion of people belonging to the sensitive attribute increases.
Źródło:
Statistics in Transition new series; 2020, 21, 5; 119-132
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Imputation of missing values by using raw moments
Autorzy:
Sohail, Muhammed Umair
Shabbir, Javid
Sohil, Fariha
Powiązania:
https://bibliotekanauki.pl/articles/1359290.pdf
Data publikacji:
2019-04-25
Wydawca:
Główny Urząd Statystyczny
Tematy:
non-response
imputation
raw moments
relative efficiency
Opis:
The estimation of population parameters might be quite laborious and inefficient, when the sample data have missing values. In comparison follow-up visits, the method of imputation has been found to be a cheaper procedure from a cost point of view. In the present study, we can enhance the performance of imputation procedures by utilizing the raw moments of the auxiliary information rather than their ranks, especially, when the ranking of the auxiliary variable is expensive or difficult to do so. Equations for bias and mean squared error are obtained by large sample approximation. Through the numerical and simulation studies it can be easily understood that the proposed method of imputation can outperform their counterparts.
Źródło:
Statistics in Transition new series; 2019, 20, 1; 21-40
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Developing calibration estimators for population mean using robust measures of dispersion under stratified random sampling
Autorzy:
Audu, Ahmed
Singh, Rajesh
Khare, Supriya
Powiązania:
https://bibliotekanauki.pl/articles/1054567.pdf
Data publikacji:
2021-06-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
calibration
outliers
percentage relative efficiency (PRE)
stratified sampling
Opis:
In this paper, two modified, design-based calibration ratio-type estimators are presented. The suggested estimators were developed under stratified random sampling using information on an auxiliary variable in the form of robust statistical measures, including Gini’s mean difference, Downton’s method and probability weighted moments. The properties (biases and MSEs) of the proposed estimators are studied up to the terms of firstorder approximation by means of Taylor’s Series approximation. The theoretical results were supported by a simulation study conducted on four bivariate populations and generated using normal, chi-square, exponential and gamma populations. The results of the study indicate that the proposed calibration scheme is more precise than any of the others considered in this paper.
Źródło:
Statistics in Transition new series; 2021, 22, 2; 125-142
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spatial variability and efficiency of treatment mean comparisons in an experiment with fodder pea using modern statistical methods.
Autorzy:
Gołaszewski, Janusz
Powiązania:
https://bibliotekanauki.pl/articles/2198840.pdf
Data publikacji:
2001-06-21
Wydawca:
Instytut Hodowli i Aklimatyzacji Roślin
Tematy:
spatial variability
ANOVA
ANCOVA
NNA
kriging
relative efficiency
Opis:
It is typical of breeding experimentation to conduct experiments on large breeding material tested on small plots with a limited number of replications. Under such conditions, observations made on adjacent plots are biased by the effect of autocorrelation and fertility trends. The actual treatment effects can be masked and the capability of the breeder to detect true treatment differences is impaired. This paper deals with the problem of the estimation of effects of spatial variability and their impact on the efficiency of treatment comparisons. The considerations are based on the results from a breeding experiment with 25 treatments of fodder pea arranged according to the partially balanced incomplete block design (IBD) with 4 replications. Plant height and seed yield were analysed with the conventional statistical method ANOVA, the nearest neighbour analysis (NNA) and kriging. Eventually, the efficiency of the neoclassical methods relative to the completely randomised design (CRD) and randomised block design (RBD) was calculated. The estimation of the treatment effect on plant height was accomplished most efficiently with the NNA, whereas the efficiency of the alternative methods in the estimation of seed yield was comparable to the efficiency of the RBD.
Źródło:
Plant Breeding and Seed Science; 2001, 45, 1; 87-98
1429-3862
2083-599X
Pojawia się w:
Plant Breeding and Seed Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biological efficiency of the Brookhaven Medical Research Reactor mixed neutron beam estimated from gene mutations in Tradescantia stamen hair cells assay
Autorzy:
Cebulska-Wasilewska, A.
Schneider, K.
Capała, J.
Coderre, J.
Powiązania:
https://bibliotekanauki.pl/articles/146139.pdf
Data publikacji:
2000
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
neutrons
relative biological efficiency
Tradescantia
Opis:
The relative biological effectiveness of low energy neutrons for the induction of various abnormalities in Tradescantia stamen hair mutation (Trad-SH) assay was studied using two clones (T-4430 and T-02), heterozygous for flower color. Dose response relationships for gene mutations induced in somatic cells of Trad-SH were investigated after irradiation with a mixed neutron beam of the Brookhaven Medical Research Reactor (BMRR), currently used in a clinical trial of boron neutron capture therapy (BNCT) for glioblastoma. To establish the RBE (relative biological effectiveness) of the BMRR beam in the induction of various biological end-points in Tradescantia, irradiation with various doses of g-rays was also performed. After irradiation all plants were cultivated several days at Brookhaven National Laboratory (BNL), the transported to Poland for screening the biological end-points. Due to the post-exposure treatment, all plants showed high levels of lethal events and alteration of the cell cycle. Plants of clone 4430 were more reactive to post-treatment conditions, resulting in decreased blooming efficiency that affected the statistics. Slope coefficients estimated from the dose response curves for gene mutation frequencies allowed the evaluation of ranges for the maximal RBE values of the applied beam vs. g-rays as 6.0 and 5.4 for the cells of T-02 and T-4430, respectively. Estimated fraction of doses from neutrons and corresponding biological effects for the clones T-02 and T-4430 allowed to evaluate the RBE values for neutrons part in the beam as 32.3 and 45.4, respectively.
Źródło:
Nukleonika; 2000, 45, 2; 115-119
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some linear regression type ratio exponential estimators for estimating the population mean based on quartile deviation and deciles
Autorzy:
Prasad, Shakti
Powiązania:
https://bibliotekanauki.pl/articles/1059039.pdf
Data publikacji:
2020-12-04
Wydawca:
Główny Urząd Statystyczny
Tematy:
Bias
Mean square error (MSE)
Auxiliary variable
Relative Efficiency (%)
Opis:
This paper deals some linear regression type ratio exponential estimators for estimating the population mean using the known values of quartile deviation and deciles of an auxiliary variable in survey sampling. The expressions of the bias and the mean square error of the suggested estimators have been derived. It was compared with the usual mean, usual ratio (Cochran (1977)), Kadilar and Cingi (2004, 2006) and Subzar et al. (2017) estimators. After comparison, the condition which makes the suggested estimators more efficient than others is found. To verify the theoretical results, numerical results are performed on two natural population data sets.
Źródło:
Statistics in Transition new series; 2020, 21, 5; 85-98
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the improvement of paired ranked set sampling to estimate population mean
Autorzy:
Rehman, Syed Abdul
Shabbir, Javid
Powiązania:
https://bibliotekanauki.pl/articles/1827556.pdf
Data publikacji:
2021-09-06
Wydawca:
Główny Urząd Statystyczny
Tematy:
order statistics
ranked set sampling
relative efficiency
unbiased estimator
imperfect ranking
Opis:
In ecological and environmental sampling the quantification of units is either difficult or overly demanding in terms of the time, money, workload, it requires. For this reason efficient and cost-effective sampling methods need to be devised for data collecting. The most commonly used method for this purpose is the Ranked Set Sampling (RSS). In this paper, a sampling scheme called Improved Paired Ranked Set Sampling (IPRSS) is proposed to estimate the population mean. The performance of the proposed IPRSS is evaluated under perfect and imperfect rankings. A simulation study based on selected hypothetical distributions and a real-life data set showed that IPRSS is more precise than RSS, Paired RSS (PRSS) or Extreme RSS (ERSS).
Źródło:
Statistics in Transition new series; 2021, 22, 3; 193-205
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of Mean in Domain When Distribution of Variable is Skewed
Estymacja średniej zmiennej o rozkładzie asymetrycznym w domenie
Autorzy:
Wywiał, Janusz L
Powiązania:
https://bibliotekanauki.pl/articles/906312.pdf
Data publikacji:
2009
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
small area sampling
skewnees coefficient
regression estimator
mean domain
relative efficiency
Opis:
Rozważana jest nadpopulacja w której wyróżniono domeny badań. Celem wnioskowania jest estymacja wartości średniej w wyróżnionej domenie. Zakłada się, że rozkład prawdopodobieństwa zmiennych w domenach może być nawet silnie asymetryczny, jednocześnie przyjmując, że wszystkie zmienne tworzące model nadpopulacji mają tę samą wariancję. Pozwala to na konstrukcję specyficznego estymatora typu regresyjnego średniej w wyróżnionej domenie. Korzysta się przy tym ze znanego faktu, że kowariancja średniej z próby i wariancji z próby jest proporcjonalna do trzeciego momentu centralnego zmiennej. Okazuje się, że proponowany estymator może dawać dokładniejsze oceny średniej w domenie, gdy właśnie rozkład zmiennej jest asymetryczny. Wykazano to na podstawie odpowiednio zaprojektowanych i przeprowadzonych badań symulacyjnych.
The problem of estimation the expected value in the case when a random variable has skewed probability distribution was considered e.g. by Carroll and Ruppert (1988), Chandra and Chambers (2006), Chen and Chen (1996), Karlberg (2000). Their results are based on transformation of skewed data. In the paper another approach is presented. The proposed estimators are constructed on the rather well known following property. Kendall and Stuart (1967) showed that the covariance between sample variance and sample mean is proportional to the third central moment of a variable. This property is applied to construction of several estimators of mean in a domain. The estimators are useful in the case when the variable under study has asymmetrical distribution because under some additional assumption they are more accurate than the sample mean. The results of the paper can be applied in survey sampling of economic populations.
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:
Two-stage cluster sampling with unequal probability sampling in the first stage and ranked set sampling in the second stage
Autorzy:
Ugwu, Michael C.
Madukaife, Mbanefo S.
Powiązania:
https://bibliotekanauki.pl/articles/2108165.pdf
Data publikacji:
2022-09-14
Wydawca:
Główny Urząd Statystyczny
Tematy:
cluster sampling
population mean estimator
probability proportional to size sampling
ranked set sampling
relative efficiency
Opis:
In this research work we introduce a new sampling design, namely a two-stage cluster sampling, where probability proportional to size with replacement is used in the first stage unit and ranked set sampling in the second in order to address the issue of marked variability in the sizes of population units concerned with first stage sampling. We obtained an unbiased estimator of the population mean and total, as well as the variance of the mean estimator. We calculated the relative efficiency of the new sampling design to the two-stage cluster sampling with simple random sampling in the first stage and ranked set sampling in the second stage. The results demonstrated that the new sampling design is more efficient than the competing design when a significant variation is observed in the first stage units.
Źródło:
Statistics in Transition new series; 2022, 23, 3; 199-214
1234-7655
Pojawia się w:
Statistics in Transition new series
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 21

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