Friedman Stata. The friedman test is a non parametric alternative to the repeated measures anova. The test requires the data to be transformed into a long format.
It is used to determine whether or not there is a statistically significant difference between the means of three or more groups in which the same subjects show up in each group. You perform a friedman test when you have one within subjects independent variable with two or more levels and a dependent variable that is not interval and normally distributed but at least ordinal. In the help window that opens scroll down to web resources from stata and other users.
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Friedman test in sas is a bit complicated. The test requires the data to be transformed into a long format. Type findit friedman in stata command window. You perform a friedman test when you have one within subjects independent variable with two or more levels and a dependent variable that is not interval and normally distributed but at least ordinal.
