Dear all,
i have a problem which deals with indexing again, i guess. I am a beginner and though i read the S Poetry stuff it is not that easy for me to use the examples for my problems, maybe all this needs some practice... Here´s the question. As i want to perform a factor analysis i need the same number of rows for every column to get a matrix that i use as an argument of factanal. I´d like to find out which of 5 question i asked explain the variance in my dataset. People were able to choose "dont know". Of course someone who didn´t know, could know the answers for the other question. To put in a nutshell, only those results are valid for my factanal in which every question is answered (which is ok, as it is that way most of the time). i have matrices question1, question2 etc which contain the answers to each question. Every person has a result id. There fore my idea is to put all the matrices into one big matrices and then just take those of out the matrices, where the resultid occurs 5 times - as i have 5 questions. And here are my two questions : a) is there some syntax that helps me with: if number of any resultid appearance in column 1 is is smaller than 5, dont put it into my new matrix ? b) is the idea in general wrong ? is there an easier way to get the matrices into one.. prepared for a factanal ? thx in advance! matthias ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.