[R] automating regression or correlations for many variables

geral geraldes at mail.ubc.ca
Mon Apr 4 22:33:15 CEST 2011


I must confess I am just a beginner, but I followed your suggestion and did
'm <- lm(as.matrix(snp[, -1])  ~ lat, data = snp) ' and it worked perfectly.
I would like to understand what is being done here. as.matrix I understand
makes my data frame be a matrix, but I don't understand the part snp[,-1]. I
think I am saying use all rows of... but I don't understand the -1, does
that mean, all columns but column 1?

I really appreciate the help! It was really really valuable. 

A related question is, what is m? If I do is.object(m) I get true. so I
guess it is an object. I now need to use each of the fitted models for more
things, such as calculate anova, etc... How do I do that? When I do this
column by column I just do anova(m), but it does not seem to work now...


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