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rownonmiss(varlist) [, strok]
may not be combined with by. It gives the number of nonmissing values in
varlist for each observation (row) -- this is the value used by rowmean()
for the denominator in the mean calculation.
是 rownonmiss
不是rownomiss


雷达卡



。不过我一般还是能立刻意识到是我打错了||||
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