Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...
Comparing the power of three different sampling patterns with the low-prevalence, high-level profile. The probability of detection is shown at 2.5th–97.5th percentile. The line with dots shows the ...
Stratified sampling more effective than random sampling for detecting contaminants in infant formula
Producers of infant formula employ comprehensive food safety systems, including product testing to ensure those systems are working. A new study from the University of Illinois Urbana-Champaign finds ...
Sankhyā: The Indian Journal of Statistics, Series B (1960-2002), Vol. 61, No. 1, Sample Surveys (Apr., 1999), pp. 187-201 (15 pages) The balanced half sample (BHS) method is a popular method for ...
Suppose that the previous student sample is actually drawn from a stratified sampling. The strata are grades in the junior high school: the 7th grade, the 8th grade, and the 9th grade. Within strata, ...
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