[R] Some clarificatins of anova() and summary ()

[Gabor Grothendieck]

Although not as good as putting it in the help pages there is
an R wiki that anyone can add to:

http://wiki.r-project.org

On Sun, Dec 14, 2008 at 5:04 PM, John Sorkin
<jsorkin at grecc.umaryland.edu> wrote:
> Ben,
> You were quite correct to indicate that Tanmoy should not use the listserver to get answers to his class assignments. Never the less, I do have some sympathy for him. The help pages for the R functions summary, anova, drop1, do not discuss the critically important issue addressed by Tanmoy's class assignment. I believe this is a serious limitation. If users do not understand the differences between the output of these three basic functions, they can easily be led astray. I am not sure who has access to the help pages, but I hope they see this Email and consider modifying the help pages so as to address the important issue highlighted by Tanmoy's class assignment.
> John
>
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)
>
>>>> Ben Bolker <bolker at ufl.edu> 12/14/2008 12:25 PM >>>
>
>
>
> Tanmoy Talukdar wrote:
>>
>> I think now I have got some understanding of the things.
>>
>> y ~ x1+x2 first adds x1 to the model and then adds x2 .
>> But y~x2+x1 adds x2 first, so the value we get are different.
>>
>> please correct me if i am wrong.
>>
>>
>
>  You are not wrong.  However, you're wearing out your welcome
> a bit by posting very frequent messages to the list. I'd strongly
> recommend that you find some more help locally, or find a
> copy of Peter Dalgaard's "Introductory Statistics with R",
> and try to work through some of these problems on your own
> a bit more.  If you can demonstrate that you've really gone
> away and read and thought about these things, and articulate
> what still doesn't make sense to you about the way R is doing
> things, and that we are not simply answering homework questions,
> you will probably get useful answers ...
>
>  good luck,
>    Ben Bolker
>
>
> --
> View this message in context: http://www.nabble.com/Some-clarificatins-of-anova%28%29-and-summary-%28%29-tp21000954p21002390.html
> Sent from the R help mailing list archive at Nabble.com.
>
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