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 contingency tables for each stratum (as defined by the strata variables) and combining each stratum's test statistic into a single statistic without compromising degrees of freedom.
Cochran-Mantel-Haenszel statistics are used to test for association controlling for these strata.
All of the variables in the specified data set are displayed in the Available Variables field.
|
Click
 to add the highlighted variable to the Strata Variable field. |