On Jun 19, 2013, at 15:02 , R. Michael Weylandt wrote: > On Wed, Jun 19, 2013 at 10:27 AM, meng <laomen...@163.com> wrote: >> Hi all: >> I met a question about lmer. >> >> fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy) >> summary(fm1) >> >> ... >> >> Fixed effects: >> Estimate Std. Error t value >> (Intercept) 251.405 6.825 36.84 >> Days 10.467 1.546 6.77 >> >> ... >> >> My question: >> Why p values of (Intercept) and Days are not given? > > Take a look at R FAQ 7.35. > > http://cran.r-project.org/doc/FAQ/R-FAQ.html#Why-are-p_002dvalues-not-displayed-when-using-lmer_0028_0029_003f > >
That's getting a bit old. It has a reference to Doug Bates posting from 2006, which basically says "because degree of freedom issues are unresolved". Important developments have happened since, and Rune's reference to package lmerTest (and, implicitly, pbkrtest) is more precise these days. -- Peter Dalgaard, Professor Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
