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19.8632
2005 Jul 05
1
by (tapply) and for loop differences
I am getting a difference in results when running some analysis using by and
tapply compare to using a for loop. I've tried searching the web but had no
luck with the keywords I used.
I've attached a simple example below to illustrates my problem. I get a
difference in the mean of yvar, diff and the p-value using tapply & by
compared to a for loop. I cannot see what I am doing wrong.