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Systematic Sampling for Milk Yield Data
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Systematic sampling is a sampling technique in which only the first unit is selected with the help of random numbers and the rest get selected automatically according to some predesigned pattern. The present study uses systematic sampling procedures for milk yield data exhibiting some non-linear trends. The data relate to milk yields of four breeds of cows and one breed of buffaloes over one lactation period during 2011-2013. The best fitted mathematical forms of non-linear trend present in the milk yield data are obtained and the expressions of average variances of the estimators of population mean under simple random, usual systematic and modified systematic sampling procedures by taking into account the trend present in the data have been derived from the formulae already derived by Ashutosh (1995) for populations showing general trend. The contents of this book are very useful in situations when a population exhibit these assumed trends.
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