I am relatively new to R and I have problem figuring out why the data file appear to be read in fine, but the one way ANOVA is not calculated correctly. In other problems this works fine.
This program is listed at the end, and the small text file in online. There are 24 data points in three groups of 8. Thus DF should be 3-1=2, not 1, and the residuals should be 24-1=23, not 22. I also get the warning, > print(model.tables(aov.ex1,"means"),digits=3) #report the means and the number of subjects/cell Warning in replications(paste("~", xx), data = mf) : non-factors ignored: Approach The grand mean is correct, but the mean for each group is not? Any pointers would be appreciated. Thanks, Johnny Liseth Stat. Grad Student #tell where the data come from datafilename="http://students.uwf.edu/ojl2/DE/prob3-5.txt" data.ex1=read.table(datafilename,header=T) #read the data into a table aov.ex1 = aov(Contributions~Approach,data=data.ex1) #do the analysis of variance summary(aov.ex1) #show the summary table print(model.tables(aov.ex1,"means"),digits=3) boxplot(Contributions~Approach,data=data.ex1) #graphical summary [[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.