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    Wyświetlanie 1-6 z 6
    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:
    Non-response and Weighting Systems in Business Tendency Surveys: Are Expectations Influenced?
    Autorzy:
    Tomczyk, Emilia
    Kowalczyk, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/500709.pdf
    Data publikacji:
    2011
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    expectations
    rationality
    non-response
    weighting
    survey data
    Opis:
    Rationality of economic agents belongs to the basic assumptions of neoclassical economic theory, and for decades it has inspired research on whether expectations are indeed formed rationally. Direct data on expectations are available mainly through business tendency surveys which are subject to various types of non-response problems. Inclination of industrial enterprises to respond may be correlated with values of measured variable, introducing response bias. Response bias may also occur as a result of introducing weighting systems to control variable size of respondents. The two key properties of rational expectations, on which the majority of empirical analyses of survey data are focused, are unbiasedness and orthogonality. We analyze several sample balance statistics and expectations series based on quantified survey data, taking into consideration issues of non-response and weighting schemes. Alternative definitions of expectations series aim to account for: 1) influence of arbitrary assumptions concerning weighting of individual data, 2) changing sample structure that results from non-response, 3) response rates varying with degree of optimism / pessimism of respondents. Results of our analysis indicate that expectations concerning relative changes in production are unbiased but not efficient with respect to freely available information, namely, observed relative changes in production (lagged three months) and expectations balance (lagged two months). This result holds for a range of weighting schemes and non-response issues analyzed, including changes introduced to sample structure by non-response, and increased inclination of “optimists” and “pessimists” to supply answers in the business tendency survey, as long as their shares remain constant in time.
    Źródło:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH; 2011, 86:Business Surveys, Business Cycles. Polish Contribution to the 30th CIRET Conference; 101-119
    0866-9503
    Pojawia się w:
    Prace i Materiały Instytutu Rozwoju Gospodarczego SGH
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Estimation of product of two population means by multiauxiliary characters under double sampling the non-respondents
    Autorzy:
    Khare, B. B.
    Sinha, R. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193073.pdf
    Data publikacji:
    2019-08-30
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    product
    bias
    mean square error
    auxiliary characters
    non-response
    Opis:
    This paper considers the problem of estimating the product of two population means using the information on multi-auxiliary characters with double sampling the non-respondents. Classes of estimators are proposed for estimating P under two different situations [discussed by Rao (1986, 90)] using known population mean of multi-auxiliary characters. Further, this problem has been extended to the case when population means of the auxiliary characters are unknown and they are estimated on the basis of a larger first phase sample. In this situation, a class of two phase sampling estimators for estimating P is suggested using multi-auxiliary characters with unknown population means in the presence of non-response. The expressions of bias and mean square error of all the proposed estimators are derived and their properties are studied. An empirical study using real data sets is given to justify the theoretical considerations.
    Źródło:
    Statistics in Transition new series; 2019, 20, 3; 81-95
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficient estimation of population mean in the presence of non-response and measurement error
    Autorzy:
    Tiwari, Kuldeep Kumar
    Sharma, Vishwantra
    Powiązania:
    https://bibliotekanauki.pl/articles/18105157.pdf
    Data publikacji:
    2023-06-13
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    non-response
    measurement error
    mean squared error
    efficiency
    mean estimation
    Opis:
    In real-world surveys, non-response and measurement errors are common, therefore studying them together seems rational. Some population mean estimators are modified and studied in the presence of non-response and measurement errors. Bias and mean squared error expressions are derived under different cases. For all estimators, a theoretical comparison is made with the sample mean per unit estimator. The Monte-Carlo simulation is used to present a detailed picture of all estimators' performance.
    Źródło:
    Statistics in Transition new series; 2023, 24, 3; 95-116
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A General Class of Mean Estimators Using Mixture of Auxiliary Variables for Two-Phase Sampling in the Presence of Non-Response
    Autorzy:
    Ahmad, Zahoor
    Zubair, Rahma
    Shahid, Ummara
    Powiązania:
    https://bibliotekanauki.pl/articles/465687.pdf
    Data publikacji:
    2014
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    non-response
    multi-auxiliary variables
    regression-cum-ratioexponential
    estimators
    no information case
    Opis:
    In this paper we have proposed a general class of estimators for two-phase sampling to estimate the population mean in the case when non-responses occur at the first phase. Furthermore, several continuous and categorical auxiliary variable(s) have been simultaneously used while constructing the class. Also, it is assumed that the information on all auxiliary variables is not available for population, which is often the case. The expressions of the mean square error of the suggested class have been derived and several special cases of the proposed class have been identified. The empirical study has also been conducted.
    Źródło:
    Statistics in Transition new series; 2014, 15, 4; 501-524
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chain Ratio Estimator for the Population Mean in the Presence of Non-Response
    Autorzy:
    Khare, B. B.
    Srivastava, U.
    Kumar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/465661.pdf
    Data publikacji:
    2012
    Wydawca:
    Główny Urząd Statystyczny
    Tematy:
    chain ratio type estimator
    preliminary sample
    bias
    mean square error
    non-response
    additional auxiliary variable
    Opis:
    In this paper we have proposed two chain ratio type estimators for population mean using two auxiliary variables in the presence of non-response. The proposed estimators have been found to be more efficient than the relevant estimators for the fixed values of preliminary sample of size n′and subsample of size n(
    Źródło:
    Statistics in Transition new series; 2012, 13, 3; 495-518
    1234-7655
    Pojawia się w:
    Statistics in Transition new series
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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