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James Brown

Posted: Tue Nov 01, 2011 3:28 pm

Joined: 22 Aug 2008 Posts: 10 Location: John Innes Centre

Please could someone explain what's happening when I get this message:

******** Warning 16, code VD 39, statement 1 on line 3032
Command: REML [PRINT=model,components,waldTests; PSE=differences; FMETHOD=automa
Error in AI algorithm when forming denominator DF for approximate F-tests.

In the analysis I'm currently doing with one of my students, I get this message with one model but not with a more complex model. Also, with this message, the Wald Tests table prints out chi-sqd tests of Wald/df. If this message doesn't appear, I get an F-test (which I suppose is preferable).

An explanation at the level of "competent user but not card-carrying statistician" would be most welcome.

James Brown

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Prof James K M Brown
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