[R] trouble with model.tables SE means

[David Winsemius]

On Dec 22, 2009, at 7:16 PM, Charles C. Berry wrote:

> On Tue, 22 Dec 2009, David Winsemius wrote:
>
>>
>>
>> On Dec 22, 2009, at 5:19 PM, Jon Prince wrote:
>>> David Winsemius wrote:
>>> > > On Dec 22, 2009, at 4:22 PM, Jon Prince wrote:
>>> > > > Hi, I'm new to R, with some experience with Matlab and SPSS.  
>>> I've > > figured out how to run my repeated measures anova and am  
>>> getting the > > right numbers for my effects (comparing with  
>>> results from other > > software), but am having trouble with the  
>>> model.tables function. > > Specifically, using:
>>> > > > > prints the means, but then won't do the SE values, instead  
>>> giving:
>>> > > > > Warning message:
>>> > > In model.tables.aovlist(fm, "means", se = TRUE) :
>>> > > SEs for type 'means' are not yet implemented"
>>> > >
>
> It means (no pun) what it says. see
>
> 	?model.tables
>
> ---
> Details:
>
>     For .type = "effects". give tables of the coefficients for
>     each term, optionally with standard errors.
>
>     For .type = "means". give tables of the mean response for each
>     combinations of levels of the factors in a term.
> ----
>
> Notice that the 'optionally with standard errors' bit only pertains  
> to "effects"

Charles;

The help page also offers this example after running aov on an "npk"  
dataframe:

model.tables(npk.aov, "means", se = TRUE)
... and the resulting object(at least on my device)  has a list of se  
values.

-- 
David.
>
> Chuck
>
>>> > > Asking for SEs for "effects" works fine, but that's not what I  
>>> want. I > > searched the help for this issue and one other person  
>>> has had this > > problem last year > > (http://markmail.org/message/k5yxxqcfiihvzvtp?q=list:r-project+model%2Etables 
>>> ), > > but the person helping them was unable to replicate it,  
>>> inferring that > > it was an out-of-date version. My version is:
>>> > > > >  R version 2.10.1 (2009-12-14)
>>> > > > > I only downloaded it the other day, and therefore cannot  
>>> have an > > outdated version. How can I fix this error and get my  
>>> SE values? > > Apologies if I have not provided sufficient  
>>> information, and thanks in > > advance for your help.
>>> > > When I look at the output of the first model.tables call  
>>> copied from the > help page, I see a list element that holds "se"  
>>> values. Try:
>>> > > model.tables(fm,"means",se=TRUE)$se
>>> > Thanks for the rapid reply! Unfortunately adding the $se returns  
>>> NULL, and repeats the same warning message ("...not yet  
>>> implemented"). If you're not experiencing the issue, is it  
>>> possible for me to replace the relevant code/source file with what  
>>> you have (or would that require recompiling)? Could this be an OS  
>>> issue? I'm running Mac OSX 10.6.2.
>>> By the way, I "replied all" on this message, but let me know if  
>>> that is not the preferred convention. Cheers,
>>
>> Reply all. That way people can correct my mistakes and general  
>> cluelessness. I'm running MacOSX 10.5.8 so it would seem less  
>> likely that is the explanation.
>>
>> 1) Did you run the example in the help pages?
>>
>> 2) When I look at :
>>
>>> methods(model.tables)
>> [1] model.tables.aov*     model.tables.aovlist*
>>
>> ... I see both an "aov" method and an "aovlist" method. Is it  
>> possible that there is something about the object that you are  
>> working on that makes it an aovlist at thus invokes a different  
>> function than what the help page invokes?
>>
>> The code would not require complination... it's available with  
>> getAnywhere() and I do not see any calls to compiled or .Internal  
>> subroutines. Tell me what happens with the above questions first.
>>
>> -- 
>> David
>>
>>> Jon
>>
>> David Winsemius, MD
>> Heritage Laboratories
>> West Hartford, CT
>>
>> ______________________________________________
>> R-help at 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.
>>
>
> Charles C. Berry                            (858) 534-2098
>                                            Dept of Family/Preventive  
> Medicine
> E mailto:cberry at tajo.ucsd.edu	            UC San Diego
> http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego  
> 92093-0901
>
>

David Winsemius, MD
Heritage Laboratories
West Hartford, CT