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.
|