If you specify a CONTROL statement, PROC SURVEYSELECT sorts the input data set by the CONTROL variables before selecting the sample. If you also specify a STRATA statement, the procedure sorts by ...

Variable expenses are costs that change over time. Fixed expenses typically stay the same and can be easier to plan for. Many, or all, of the products featured on this page are from our advertising ...

Then an example of variable selection with four response variables and two methods is given and we conclude by making some recommendations for their routine use. The Statistician joined the Journal of ...

Scientists often want to find out if changing one variable makes a difference to other variables. In many (though not all) investigations the variables are kept constant - the control variables ...