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max_es_time
2007 Nov 09
3
Normalizing grouped data in a data frame
Hi
I am a newbie to R but have tried a number of ways in R to do this and
can't find a good solution. (I could do it out of R in perl or awk but
would like to know how to do this in R).
I have a large data frame 49 variables and 7000 observations however for
simplicity I can express it in the following data frame
Base, Image, LVEF, ES_Time
A, 1, 4.32, 0.89
A, 2, 4.98, 0.67
A, 3, 3.7, 0.5