[R] return()
Dear R Help, Why is it that if you try to return more than one objects using return(), it says it is 'deprecated'? So how do I return more than 1 objects back to the parent function? Thanks, Tim __ 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.
[R] How do I create an object in the Global environment from a function
Hi all, Say I have created an object b in my function myfunc - function() b - 34 How can I make b an object in the Global environment and not just in the environment of myfunc? Thanks, Tim __ 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.
[R] Stepwise regression
Dear all, I am wondering why the step() procedure in R has the description 'Select a formula-based model by AIC'. I have been using Stata and SPSS and neither package made any reference to AIC in its stepwise procedure, and I read from an earlier R-Help post that step() is really the 'usual' way for doing stepwise (R Help post from Prof Ripley, Fri, 2 Apr 1999 05:06:03 +0100 (BST)). My understanding of the 'usual' way of doing say forward regression is that variables whose p value drops below a criterion (commonly 0.05) become candidates for being included in the model, and the one with the lowest p among these gets chosen, and the step is repeated until all p values not in the model are above 0.05, cf Hosmer and Lemeshow (1989) Applied Logistic Regression. The procedure does not require examination of the AIC. I am not well aquainted with R enough to understand the codes used in step(), so can somebody tell me how step() works? Thanks very much, Tim __ 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.
[R] Stepwise regression
Dear all, I am wondering why the step() procedure in R has the description 'Select a formula-based model by AIC'. I have been using Stata and SPSS and neither package made any reference to AIC in its stepwise procedure, and I read from an earlier R-Help post that step() is really the 'usual' way for doing stepwise (R Help post from Prof Ripley, Fri, 2 Apr 1999 05:06:03 +0100 (BST)). My understanding of the 'usual' way of doing say forward regression is that variables whose p value drops below a criterion (commonly 0.05) become candidates for being included in the model, and the one with the lowest p among these gets chosen, and the step is repeated until all p values not in the model are above 0.05, cf Hosmer and Lemeshow (1989) Applied Logistic Regression. The procedure does not require examination of the AIC. I am not well aquainted with R enough to understand the codes used in step(), so can somebody tell me how step() works? Thanks very much, Tim __ 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.
[R] 2 questions
Hi all, I'm new here. Want to ask two possibly quite basic questions: 1. How can I clear all objects in one stroke? 2. How can I perform a regression with independent variables specified by an object? Thanks, Tim __ 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.
