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

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