Jim Lemon wrote:
Michael Just wrote:
Thank you all for you suggestions. They are all helpful. However, I
have come to a more fundamental problem. Preparing my data to even
make such a graph. I thought I was ready. I will obviously need to
find the n, mean, and confidence interval for my data before I can
plot them. for some of these plots.
I thought perhaps this data manipulation would be easily done in R,
but perhaps I should do it elsewhere and then bring it into R. I have
about 5000 rows & about 30 columns in my csv. I need to find: mean, n,
confidence interval for a to-be-made selection from the entire data set.
I have tried: aggregate, subset, dat$col1=2, etc
Clearer?: I want to select data from my dataset where column1=2. Then
when plotting this data I want to group it by 2 values (out of 4) from
column10.
Hi Michael,
The describe function in the prettyR package might get the summaries you
want. I think you want to set num.desc=c("mean","std.error","valid.n").
Combine describe with the "by" function to perform the subsetting, and
you should get what you want.
Jim
Also see the book by Harrell and Alzola and many other documents linked
from http://biostat.mc.vanderbilt.edu/RS
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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