[R-sig-ME] A consultation about lmer

[何如梦]

 I have some confusion about the use of lmer. As I learned the data should  be normal distributed when use liner mixed model. I tested the exmple  data (Reaction$sleepstudy) by using shapiro.test. The result shows that  it was not normal distributed.  So I have some confusion about the requirment of data distribution in function lmer and glmmer.
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