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Hi, people I am just new to R, when writing my loop functions, I meet a problem. There are some data frames, their names is randomized, ( e.g. a1,b3,c7, etc), what should I write it when I want to see them printed together in a loop function? I have tried : > for ( df in 'a1','b3','c7') { + print(print(df)) + } the

Hi, people. I am using R-2.5.0 now, when tried the function aggregate with sum, it showed an error as following: > a <- gl(3,10) > b <- rnorm(30) > aggregate(b,list(a),sum) # here is the error message, it complained that an error in FUN(X[[1L]], missing "INDEX", and no defaults value. but the tapply function will be okay. > tapply(b,list(a),sum) 1 2

hi, people How can we compare two probit models brought out from the same data? Let me use the example used in "An Introduction to R". "Consider a small, artificial example, from Silvey (1970). On the Aegean island of Kalythos the male inhabitants suffer from a congenital eye disease, the effects of which become more marked with increasing age. Samples of islander males