R proramming:
form<-MOP~PE+WOR+RD
pooltest(form, data=well, effect="individual", model="within")
Waning message:
F statistic
data: form
F = -0.4676, df1 = 21753, df2 = -5990, p-value = NA
alternative hypothesis: unstability
Warning message:
In pf(q, df1, df2, lower.tail, log.p) : NaNs produced
p值是NA。为什么?是我的数据有问题吗?我的数据行数是15914,其中MOP有4484是零值。是不是这些零值才算不出来的?


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