Comments (3)
jpritikin
commented on June 19, 2024
On Tue, Apr 04, 2017 at 01:12:49PM -0700, Tim Bates wrote:
mxCompare is the preferred way to see an AIC comparison of models. But
mxCompare now warns users to use AIC comparison... Can we remove this
warning? Or establish who wants to be warned about this?
mxCompare(m2, m1) # ADE is better
base comparison ep minus2LL df AIC diffLL diffdf p
1 ADE <NA> 4 9658.230 3851 1956.230 NA NA NA
2 ADE ACE 4 9659.215 3851 1957.215 0.9849158 0 NA
Warning message:
In collectStatistics(nextBaseSummary, nextCompareSummary) :
Model 'ADE' has the same degrees of freedom as ACE which means the models are
not nested and should not be compared with the likelihood ratio test. Compare th
ese models using the information criteria statistics
Instead of a warning, how about if we set diffLL to NA when df are
equal?
β¦--
Joshua N. Pritikin, Ph.D.
Virginia Institute for Psychiatric and Behavioral Genetics
Virginia Commonwealth University
PO Box 980126
800 E Leigh St, Biotech One, Suite 1-133
Richmond, VA 23219
http://exuberant-island.surge.sh
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tbates
commented on June 19, 2024
Just setting the p-value to NA (as it happening) is plenty of warning to people, without any other information.
I would just not print the warning at all. The only candidates for being helped by it are new-users, who are instead terrified by it, unnecessarily.
Definitely don't put fake numbers in for Ξ-2ll: Much to easy to misinterpret as factual.
The difference often is far from zero (which is what drives the AICs apart). It's only the p-value which we wish to direct people away from, and this is set to NA (used to be a very small actual value like 5e-17 or so)
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jpritikin
commented on June 19, 2024
Fixed in v2.7.9-72-g1ff36c605
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