Hi.
How would you calculate df for a mixed effect model?    In evaluating
contribution of an additional term to a previous model, I use
  -2*log[ Like.reduced.model / Like.larger.model], which follows Chisquare
distribution.   Using "lme4" package, the output from "anova(reduced.model,
larger.model)" includes df of each model.  However, I have no clue of how
the df is calculated.   I greatly appreciate your response if you have an
idea.   Thank you,
Saang-Yoon

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