in two sample tests, grouping variable should show *all* categorical variables, but then alert if select a variable with more than two groups

[gweinberg]

Problem

Every semester I have to explain to students why, in two-sample tests, they can't select certain variables to group by (because they don't realize those variables have more than two categories). In fact, apparently this semester, even a TA didn't understand, and told the students the wrong thing (they said there was a bug in the platform).

So, request as follows:

In two-sample tests, when selecting the "group by" variable, all the variables should appear in the drop-down; then the functionality is as follows:

• If a categorical variable with more than two groups is selected, the panel shows an alert like, "cannot group by that variable, since it has more than two categories."
• If a quantitative variable is selected, the panel shows an alert like, "cannot group by that variable, since it is not categorical."

Solution

see above

Alternatives

No response

Additional context

None.