This might be easy but I'm very new to R and this question doesn't seem to have any nice keywords that bring up relevant search results when I search the CRAN search engine. Therefore, I'll plead (as I have in the recent past) Newbie status.
I have a data frame with two factors (Factor 1 and 2) which together specify another unique level. I want to create a third factor in the data frame that captures this uniqueness. For example, say I had dataframe, Df, with Factors, 1 and 2. I want to create Factor 3 and add it to my Df dataframe. i.e. Df dataframe: WANT TO Row# Factor1 Factor2 CREATE THIS: Factor 3 Data 1 1 1 1 23 2 1 2 2 43 3 1 2 2 19 4 1 2 2 11 5 1 4 3 3 6 1 4 3 13 7 3 1 4 52 8 3 1 4 12 9 3 1 4 9 10 3 3 5 21 11 3 3 5 43 12 4 1 6 32 13 4 1 6 18 14 4 2 7 52 15 4 2 7 21 and of course, I'm trying to create Factor 3 without loops.. My end goal here (which I add because maybe I don't need to create Factor 3 (although I'm still curious)), is to bootstrap "sample" Factor 3. I want to repeatedly grab, say, 3 levels of Factor 3, and take the mean of those levels (e.g. say in my first bootstrap sample, I grab levels 2,4, and 7 from Factor 3, then I want to take the mean of rows, 2,3,4,7,8,9,14,15). Of course, each sample from Factor 3 for my bootstrap will most likely have a differing number of rows since my experiment is not balanced. I'm not sure if this is an issue yet when I try to implement the "boot" function in R (I haven't gotten to that point yet). Any help is appreciated! Thanks! -Scott Scott Norton, Ph.D. Engineering Manager Nanoplex Technologies, Inc. 2375 Garcia Ave. Mountain View, CA 94043 www.nanoplextech.com <http://www.nanoplextech.com/> [EMAIL PROTECTED] [[alternative HTML version deleted]] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
