[R] A quesiton on data manipulation

From: Tong Wang <wangtong_at_usc.edu>
Date: Sat 28 Oct 2006 - 22:56:49 GMT


    I have a data set (data frame) describing some features of the students in a high school in the following format:

Stu ID        Year         feature 1          feature 2      ............. 
1001         1990     
1001         1991
1001         1992
1002         1990
1002         1991
1002         1992

   Some features of a few of these students are missing, I would like to ignore those students in my analysis, but I really can' t figure out a neat way to do this in R. I need to remove all the info. of a student (indicated by ID no.) if there are NA's in his/her features.

    Could someone give me a quick tutorial on this ?

I would really appreciate.


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