As another follow-up related to aov, I want to extract values (Residual interaction mean square & interaction DF) from the results: asummary<-summary(aov.recall) The results are in a list() format with 3 lists, and contents within each list are without "names".
I am not able to do something like in other statistics such as in t.test: >as.numeric(t.test(serie1,serie2,na.rm=TRUE)$statistic) What method should I use to extract, or is it simpler to write compute the figures that I need directly in this case? Thanks a lot! - John On Mon, Jun 1, 2009 at 7:08 PM, Mike Lawrence <mike.lawre...@dal.ca> wrote: > On Mon, Jun 1, 2009 at 7:50 PM, tsunhin wong <thjw...@gmail.com> wrote: >> But I have some follow-up questions: >> 1. In aov, why IVs (subject & condition) cannot be in number format? > > Put simply, because that's the only way to obtain the values you > observe in the paper you're reading. :Op Factorizing tells the ANOVA > that the labels associated with each level of the factor aren't really > meaningful. This is particularly evident in the case of Subject > numbers, which (typically) have no numeric interpretation (Ss #6 is > not 2 times Ss #3). The original authors' choice to treat condition as > a factor was a less clear choice given that it clearly refers to a > measurable ratio quantity (seconds). I presume the paper to which > you're referring is the Masson & Loftus 1994 paper (be sure to read > their 2003 follow-up and 2004 correction). In that case the authors > come from a field where it's commonplace to treat even ratio > independent variables as factored. > >> 2. Why I need to use factor() on IVs (subject & condition) but I >> cannot use factor() on DV (recall)? > > As noted above, factoring prohibits R from interpreting the labels of > a value as numerically meaningful, something you surely do not want to > do with your DV in this example. > > > -- > Mike Lawrence > Graduate Student > Department of Psychology > Dalhousie University > > Looking to arrange a meeting? Check my public calendar: > http://tr.im/mikes_public_calendar > > ~ Certainty is folly... I think. ~ > ______________________________________________ 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.
