Re: [R] SPSS F-test on change in R square between hierarchical models
Christopher, I am wondering if anyone knows how to perform an F-test on the change in R square between hierarchical models in R? SPSS provides this information and a researcher that I am working with is interested in getting this information. Alternatively, if someone knows how I can calculate the test statistic (SPSS calls it F-change?) and dfs that would be helpful as well. What you describe is just the standard F test for comparing two models, or testing deviance reduction between tow *nested* models (I suspect this is what you mean by hierarchical). The anova() function will do that. The R2STATS GUI will also give you these tests, along with the R-squared, in the same table. A common misconception about an F-test is that it is the test on a variable effect, when strictly speaking it is a test on the deviance reduction between two models that include or not that particular variable (and there may be several ways to do that, each leading to possibly different F-values). Yvonnick Noel University of Brittany Department of Psychology Rennes, France __ 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] SPSS F-test on change in R square between hierarchical models
Hi, I am wondering if anyone knows how to perform an F-test on the change in R square between hierarchical models in R? SPSS provides this information and a researcher that I am working with is interested in getting this information. Alternatively, if someone knows how I can calculate the test statistic (SPSS calls it F-change?) and dfs that would be helpful as well. The output and the test I am looking for is available here - http://dl.dropbox.com/u/1501309/spss_rsquared.pdf Chris On Wed, Nov 23, 2011 at 6:20 AM, Smart Guy smartgu...@gmail.com wrote: Hi All, I was adding a new row of data to my data frame using rbind(). I was surprised to see that after adding new row, I lost my data frame level attibute as well as col level attribute. Please help me to insert a new row at frist or middle position so that my custom attribute is not lost. Here is what I did. age-c(15,20,18) weight-c(40,42,30) ### creating my data frame mydata - data.frame(age,weight) ### creating data frame level attribute attr(mydata,myattr)-c(myinfo) ### creating col level attribute for 'age' column ### attr(mydata$age,mycolattr)-c(mycolinfo) Checking attributes ### attributes(mydata) attributes(mydata$age) ### creating new row # newrow - data.frame(age=16, weight= 42) Inserting newrow as first row to my data frame mydata- rbind(newrow, mydata) Checking attributes again ### I lost my custom attributes attributes(mydata$age) attributes(mydata) Thanks in advance, -- SG [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] SPSS F-test on change in R square between hierarchical models
Probably ?anova ?add1 ?drop1 are what you're looking for. -- Bert On Wed, Nov 23, 2011 at 6:07 AM, Christopher Desjardins desja...@umn.edu wrote: Hi, I am wondering if anyone knows how to perform an F-test on the change in R square between hierarchical models in R? SPSS provides this information and a researcher that I am working with is interested in getting this information. Alternatively, if someone knows how I can calculate the test statistic (SPSS calls it F-change?) and dfs that would be helpful as well. The output and the test I am looking for is available here - http://dl.dropbox.com/u/1501309/spss_rsquared.pdf Chris On Wed, Nov 23, 2011 at 6:20 AM, Smart Guy smartgu...@gmail.com wrote: Hi All, I was adding a new row of data to my data frame using rbind(). I was surprised to see that after adding new row, I lost my data frame level attibute as well as col level attribute. Please help me to insert a new row at frist or middle position so that my custom attribute is not lost. Here is what I did. age-c(15,20,18) weight-c(40,42,30) ### creating my data frame mydata - data.frame(age,weight) ### creating data frame level attribute attr(mydata,myattr)-c(myinfo) ### creating col level attribute for 'age' column ### attr(mydata$age,mycolattr)-c(mycolinfo) Checking attributes ### attributes(mydata) attributes(mydata$age) ### creating new row # newrow - data.frame(age=16, weight= 42) Inserting newrow as first row to my data frame mydata- rbind(newrow, mydata) Checking attributes again ### I lost my custom attributes attributes(mydata$age) attributes(mydata) Thanks in advance, -- SG [[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. [[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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm __ 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.
