Strata Variable

Use this feature to specify a variable that defines different strata of your experiment. In a stratified analysis, categorical variables can be adjusted for and designs such as matched or nested case-control can be accommodated by creating separate contigency tables for each stratum (as defined by the strata variables) and combining each stratum's test statisticinto a single statistic without compromising degrees of freedom.

Cochran-Mantel-Haenszel statistics are used to test for association controlling for these strata.

To Specify a Strata Variable:

8

Specify the Input SAS Data Set.

All of the variables in the specified data set are displayed in the Available Variables field.

8

Examine the list of available variables.

8

Highlight the desired variable.

8

Click to add the highlighted variable to the Strata Variable field.