Re: [R] Long model formulae
Here is a dodge I often use. This is a mock-up example. ___ bar - data.frame(matrix(rnorm(1001), nrow = 1)) names(bar)[1] - y ## say head(bar[,1:5]) nbar - names(bar) form - as.formula(paste(nbar[1], ~, paste(nbar[-1], collapse = +))) fitModel - substitute(tm - rpart(FORM, data = DATA), list(FORM = form, DATA = quote(bar))) fitModel ## the screen quietly erupts... library(rpart) eval(fitModel) ## to do the job. ___ The advantage of proceeding this way is that the object you create, fm, has a meaningful (but large!) formula in it and the name of the dataframe from which the variables come. This makes it easy, e.g. to use manipulation tools on it. -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of James Hirschorn Sent: Sunday, 24 October 2010 11:51 AM To: r-help@r-project.org Subject: [R] Long model formulae What is a good way to enter a very long model formula. For example: y ~ Input.2 + Input.3 + ... + Input.1000 (assuming the corresponding dataframe has many other columns). Is there a way to convert a character string to a formula? Are there command line expansions in R besides the simple '.'? Thanks. [[alternative HTML version deleted]] __ R-help@r-project.org 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. __ R-help@r-project.org 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.
Re: [R] Long model formulae
Here is a dodge I often use. This is a mock-up example. Very instructive (and helpful) ... ___ bar - data.frame(matrix(rnorm(1001), nrow = 1)) names(bar)[1] - y ## say head(bar[,1:5]) nbar - names(bar) form - as.formula(paste(nbar[1], ~, paste(nbar[-1], collapse = +))) fitModel - substitute(tm - rpart(FORM, data = DATA), list(FORM = form, DATA = quote(bar))) fitModel ## the screen quietly erupts... library(rpart) eval(fitModel) ## to do the job. ___ The advantage of proceeding this way is that the object you create, fm, has a meaningful (but large!) formula in it and the name of the dataframe from which the variables come. This makes it easy, e.g. to use manipulation tools on it. __ R-help@r-project.org 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.
[R] Long model formulae
What is a good way to enter a very long model formula. For example: y ~ Input.2 + Input.3 + ... + Input.1000 (assuming the corresponding dataframe has many other columns). Is there a way to convert a character string to a formula? Are there command line expansions in R besides the simple '.'? Thanks. [[alternative HTML version deleted]] __ R-help@r-project.org 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.
Re: [R] Long model formulae
On Sat, Oct 23, 2010 at 9:51 PM, James Hirschorn james.hirsch...@hotmail.com wrote: What is a good way to enter a very long model formula. For example: y ~ Input.2 + Input.3 + ... + Input.1000 (assuming the corresponding dataframe has many other columns). Is there a way to convert a character string to a formula? Are there command line expansions in R besides the simple '.'? If y is in column 1 and Input.2, ..., Input.1000 are in columns 2 through 1000 then try this: lm(y ~., DF[1:1000]) -- Statistics Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com __ R-help@r-project.org 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.
Re: [R] Long model formulae
On Oct 23, 2010, at 6:56 PM, Gabor Grothendieck wrote: On Sat, Oct 23, 2010 at 9:51 PM, James Hirschorn james.hirsch...@hotmail.com wrote: What is a good way to enter a very long model formula. For example: y ~ Input.2 + Input.3 + ... + Input.1000 (assuming the corresponding dataframe has many other columns). Is there a way to convert a character string to a formula? Are there command line expansions in R besides the simple '.'? If y is in column 1 and Input.2, ..., Input.1000 are in columns 2 through 1000 then try this: lm(y ~., DF[1:1000]) I guess the next logical(?) question would be: If the independent variables of interest are in columns 3,5,6,7,8,9,10,and 13 and the dependent variable is in column 20, would this work: lm(y ~., data=DF[c(20, 3,5,6:10, 13)]) # ? with any consecutive columns specified with the : operator? Or perhaps with grep(patt) in with the column indices? -- David. __ R-help@r-project.org 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.
