Displaying 2 results from an estimated 2 matches for "2xlog".
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xlog
2002 Nov 28
1
output on glm.nb
Hi,
I make a model and have compared with null model.
anova(mnull,m1)
Model theta Resid. df 2xlog-lik test df LR stat. Pr(chi)
1 ... 0.39 161 -577.9129 NA NA NA
2 ... 1.30 150 -475.6839 1 vs 2 11 102.229 1.11e10-16
anova(m1)
Df Deviance Resid. Df Resid. Dev P(>|chi|)
NULL 161 282.139 9...
... ......
2007 Jan 17
2
Effect size in GLIM models
...lained by each interaction
and main effect, and the percentage deviance attributable to each factor
can be calculated from NULL deviance.
However, we estimate probabilities by subsequent deletion of terms, and
this gives the LR statistic. Expressing the value of the LR statistic as
a percentage of 2xlog-like in a model without any factors, gives lower
values than the former procedure.
Are either of these appropriate? If so which is best, or alternatively
how can % deviance be calculated. We require % deviance explained by
each factor or interaction, because we need to compare individual
factors...