To select a sample with PROC SURVEYSELECT, you input a SAS data set that contains the sampling frame, or list of units from which the sample is to be selected. You also specify the selection method, ...

Adherence to regulatory limits for mycotoxins in agricultural commodities is important to safeguard consumers and to permit trade in affected commodities across international borders. Reliable ...

Consider the example in the section "Stratified Sampling". The study population is a junior high school with a total of 4,000 students in grades 7, 8, and 9. Researchers want to know how much these ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Understanding the differences between convenience, target, and self-selected samples. Representative samples and sampling are addressed multiple times in the cGMPs. For example, in Part 21 of the Code ...

The authors present a simple way to qualify a swab-sampling procedure for its ability to recover residues of a small-molecule API from cleaned equipment surfaces. Spiking studies were specifically ...