two sample tests should allow user to specify which group is "first" and which group is "second"

[gweinberg]

Problem

Currently, in Toolbox -> Tests -> two sample mean or two sample proportion, it's not clear which group it chooses as "first" and which group it chooses as "second". As a result, if you select, say, "less than", it's not clear whether, for instance, it's going to test mu_A < mu_B, or mu_B < mu_A.

[Of course experienced users will merely see the result and then re-do it if it wasn't the intended way, but beginning learners are more likely to be confused and not notice.]

So, request for the test-of-two-group panel to be redesigned so that it's clear which group it will choose as "first" and which as "second", or even, give the user a way to specify.

How about maybe, just under the "group" pulldown there's a space, and once you select the "group" variable, then some new text and a new pulldown appear, like:

(I know it's already possible for panels to make new text and a new pulldown containing the category names after a previous pulldown has been selected, because we already do it for one proportion test: After the group variable is selected, then the panel shows a new pulldown asking which category is "success".)

Solution

see above

Alternatives

No response

Additional context

None.