You understand what I meant. I should say it more clearly in my original post.
Regards, Peng On Mon, Sep 14, 2009 at 7:30 PM, Greg Snow <greg.s...@imail.org> wrote: > I think Penkyu is not asking for the statistical definitions, but rather some > help for what the different parts of the object are. Elements like > coefficients and residuals seem fairly obvious (but could still be somewhat > ambiguous, are the residuals raw/standardized/studentized/etc.). Objects > like call and terms are less obvious. > > I remember doing ?lm.object to get a help page detailing the objects, but > that was probably in S-PLUS (not in the version of R on my laptop). In this > case, many of the details are on the help page for lm, which is only obvious > when you realize that aov is a wrapper for lm, but not quite so obvious for > the beginner (so Peng Yu, look at ?lm). > > You can also examine the structure of the object using the str function (or > tkListView in the TeachingDemos package). But most of the time you will not > directly access these parts of the object. Look at the help pages ?coef, > ?resid, and ?fitted for some examples, do a plot of the object for other > examples. > > There are also several books and online documents that give examples of doing > regressions/anovas showing how to use some of the parts of the aov/lm object, > some of which have packages as companions with code and examples (MASS, > hmisc, HSAUR, car, daag come to mind, there are probably a lot more). > > -- > Gregory (Greg) L. Snow Ph.D. > Statistical Data Center > Intermountain Healthcare > greg.s...@imail.org > 801.408.8111 > >> -----Original Message----- >> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- >> project.org] On Behalf Of David Winsemius >> Sent: Monday, September 14, 2009 4:02 PM >> To: Peng Yu >> Cc: r-h...@stat.math.ethz.ch >> Subject: Re: [R] What are the return values of aov? >> >> >> On Sep 14, 2009, at 5:29 PM, Peng Yu wrote: >> >> > Hi, >> > >> > I get the following variables. Instead of guessing what they mean, is >> > there a centralized location in R help() that describes their meaning >> > and usage? >> > >> >> names(afit) >> > [1] "coefficients" "residuals" "effects" "rank" >> > [5] "fitted.values" "assign" "qr" "df.residual" >> > [9] "contrasts" "xlevels" "call" "terms" >> > [13] "model" >> >> Probably not. Neither the help pages nor the R-help mailing list are >> set up to teach you even basic statistics much less all of the >> concepts needed to understand the reasons for creating all of items. >> Buy yourself some books and start reading. The text which for many >> years was the only source was "Modern Applied Statistics with S" and >> if you had some grounding in basic statistics it might be one place, >> but I'm guessing you might want to start with something more basic. >> >> [76] William N. Venables and Brian D. Ripley. Modern Applied >> Statistics with S. Fourth Edition >> >> There are quite a few other texts that have come out in the last few >> years: >> >> http://www.r-project.org/doc/bib/R-books.html >> >> Perhaps: >> [32] Peter Dalgaard. Introductory Statistics with R. >> >> My favorite is Harrell's, "Regression Modeling Strategies", but it's >> not an introductory text and it's not really designed to teach R/S+. >> >> You might also look at: >> http://cran.r-project.org/other-docs.html >> >> -- >> David. >> >> > >> > On Mon, Sep 14, 2009 at 4:01 PM, Jorge Ivan Velez >> > <jorgeivanve...@gmail.com> wrote: >> >> Hi Peng, >> >> Try >> >> names( your_aov_object ) >> >> str( your_aov_object ) >> >> HTH, >> >> Jorge >> >> >> >> >> >> On Mon, Sep 14, 2009 at 4:58 PM, Peng Yu <pengyu...@gmail.com> >> wrote: >> >>> >> >>> Hi, >> >>> >> >>> I don't quite understand what are the return values of aov. I know >> >>> that it has 'coefficients'. But I need to know what all the other >> >>> return values are. Can somebody let me know how to figure them? >> >>> >> >>> Value: >> >>> >> >>> An object of class 'c("aov", "lm")' or for multiple responses >> of >> >>> class 'c("maov", "aov", "mlm", "lm")' or for multiple error >> >>> strata >> >>> of class '"aovlist"'. There are 'print' and 'summary' methods >> >>> available for these. >> >>> >> >>> >> >>> Regards, >> >>> Peng >> >>> >> >>> ______________________________________________ >> >>> 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. >> >> David Winsemius, MD >> Heritage Laboratories >> West Hartford, CT >> >> ______________________________________________ >> 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.
