Multiple-start balanced modified systematic sampling in the presence of linear trend |
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Authors: | L R Naidoo D North T Zewotir R Arnab |
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Institution: | 1. School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban, South Africalewereeve@hotmail.com;3. School of Mathematics, Statistics and Computer Science, University of KwaZulu-Natal, Durban, South Africa;4. Department of Statistics, University of Botswana, Gaborone, Botswana |
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Abstract: | ABSTRACTIn this paper, we propose a sampling design termed as multiple-start balanced modified systematic sampling (MBMSS), which involves the supplementation of two or more balanced modified systematic samples, thus permitting us to obtain an unbiased estimate of the associated sampling variance. There are five cases for this design and in the presence of linear trend only one of these cases is optimal. To further improve results for the other cases, we propose an estimator that removes linear trend by applying weights to the first and last sampling units of the selected balanced modified systematic samples and is thus termed as the MBMSS with end corrections (MBMSSEC) estimator. By assuming a linear trend model averaged over a super-population model, we will compare the expected mean square errors (MSEs) of the proposed sample means, to that of simple random sampling (SRS), linear systematic sampling (LSS), stratified random sampling (STR), multiple-start linear systematic sampling (MLSS), and other modified MLSS estimators. As a result, MBMSS is optimal for one of the five possible cases, while the MBMSSEC estimator is preferred for three of the other four cases. |
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Keywords: | Linear systematic sampling Mean square error Super-population model Unbiased Variance |
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