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seratio
2012 Dec 16
3
how to handle NA values in aggregate()
Dear All:
I am trying to calculate four columns' means in a dataframe like this:
FID MID IID EW_INCU EW_17.5 EMW EEratio
1 4621 TWF2H5 45.26 NA 15.61 NA
1 4621 TWF2H6 48.02 44.09 13.41 0.3041506
2 4630 TWF2H19 51.44 47.81 NA NA
2 4631 TWF2H21 NA 52.72 16.70 0.3167678
2 4632 TWF2H22 55.70 50....