Complex sample designs, involving stratified and/or multistage sampling with sample weighting, along with frequency matching, are used to select controls or cases for case–control studies. Examples ...
The ability to preserve samples for extended periods of time is crucial especially in the histology field. BINDER’s ultralow temperature freezers (Figure 1) help Propath to preserve histological ...
The SURVEYSELECT procedure provides a variety of methods for selecting probability-based random samples. The procedure can select a simple random sample or a sample according to a complex multistage ...
Agilent Technologies Inc. has announced the release of “Sample Preparation Fundamentals for Chromatography,” written by sample preparation expert Ronald E. Majors, Ph.D. The publication is a ...
A new variance estimator was suggested implicitly by Durbin (1967), for use in a particular multistage sampling procedure. The suggestion can easily be extended to cover the general case in which ...
The SURVEYMEANS procedure uses the Taylor expansion method to estimate sampling errors of estimators based on complex sample designs. This method obtains a linear approximation for the estimator and ...
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