validate q.mrot.choose against PQMethod

[maxheld83]

so, looking good, but turns out PQMethod actually does re-order as per #273, so that's something to keep in mind.

[maxheld83]

this is done.

I have tested 2 setups in both programs.

• qmethod(dataset = lipset[[1]], nfactors = 3, rotation = "none", quietly = TRUE, reorder = FALSE)
• qmethod(dataset = lipset[[1]], nfactors = 4, rotation = "varimax", quietly = TRUE, reorder = FALSE)

Manual rotations, resultant loadings and plots check out.

Notes:

• PQMethod got very slow - must be my machine or the screencast or sth
• PQMethod does reorder same as #273 leading to some confusion
• the script for validating is included as test_q.mrot.choose.R in testthat in the repo, though it must always (and is) skipped, because, well, it's interactive.

YouTube video of the affair is currently uploading.

Documentation has been amended to reflect the validation.

[maxheld83]

oh, and here is the result for the 2nd analysis, couldn't get the first one, but it's all in the video.

[maxheld83]

I should add: the validation of the interactive part of this feature, q.mrot.choose is actually relatively unimportant, because / as long as q.mrot.do does what it says it does (it has a bunch of unit tests).

Recall that q.mrot.do applies an arbitrary rotation matrix to a results object, and re-runs all of the qmethod steps accordingly. Crucially, this q.mrot.do, with, say, a manually supplied varimax rotation matrix must be the same as a qmethod(rotation = varimax) results object – if that is so, the rotation works fine. That is now part of the test.

q.mrot.choose merely calls q.mrot.do over, and over again, and it plots results from this results object, so in a way, users always get what they see (because q.mrot.choose merely returns the last rotation matrix).

So, the interactive function -- which cannot be programmatically tested -- is, luckily, not so important.

That being said, I have tested it against PQMethod, and it works fine.

It also meets the expectations (direction of rotation, changes of other plots, etc.).

[maxheld83]

and here's the abovementioned video: https://www.youtube.com/watch?v=4Nk5gYmlzM8&edit=vd