Try summary(fm1) Andrzej On 5/22/2012 1:56 PM, Gang Chen wrote: I know how to obtain the fixed effects from a mer object: > (fm1<- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)) fixef(fm1) or, > getME(fm1, 'beta') But how can I obtain the t-statistic values for the fixed effects? Thanks, Gang