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...te(10, matrix(rnorm(4),2), simplify = F) My goal is to calculate LS estimates of vectors "a1" and "a2". Can anyone please guide me how to do that in R? Is there any special function to handle this kind of problem? Thanks -- View this message in context: http://www.nabble.com/%22Special%22-LS-estimation-problem-tp25083103p25083103.html Sent from the R help mailing list archive at Nabble.com.