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Re: Multivariate Analysis in MIXED

Posted by Bruce Weaver on Jul 09, 2023; 9:37pm
URL: http://spssx-discussion.165.s1.nabble.com/Multivariate-Analysis-in-MIXED-tp1092023p5741141.html

Due to some changes at Nabble a few years ago, the link I gave below no longer works.  Here is the current version:  

http://spssx-discussion.165.s1.nabble.com/Multivariate-Mixed-Model-Follow-Up-td3392871.html

Bruce Weaver wrote
Thanks Ryan.  I'd forgotten about your follow-up post, and didn't spot it when searching the archives.  For those who prefer using the Nabble archive, here's the link to Ryan's more recent post:

http://spssx-discussion.1045642.n5.nabble.com/Multivariate-Mixed-Model-Follow-Up-td3392871.html


Ryan Black wrote
Bruce,

That's a pretty old post. I actually wrote back to the list suggesting a better approach (another old post, but more recent). Whether it is consistent with that online presentation I cannot investigate at this time.

More recent post here:

https://listserv.uga.edu/cgi-bin/wa?A2=ind1102&L=SPSSX-L&P=R51830

Ryan

Sent from my iPhone

> On Oct 27, 2015, at 3:37 PM, Bruce Weaver <[hidden email]> wrote:
>
> I just noticed that textbook author Ronald Heck has a set of slides showing
> this same approach to multivariate analysis via MIXED.  You can view them
> here:
>
>   http://www2.hawaii.edu/~ltabata/mlm/ppt5-multivarmodels.html
>
>
>
>
> Ryan Black wrote
>> For those interested, I've provided steps to running a multivariate
>> analysis in the MIXED procedure in PASW 17.
>>
>> In order to run a multivariate analysis employing the MIXED procedure, one
>> would need to add an indicator variable as a link to the response
>> variables to the data set. Also, in order to allow for separate intercepts
>> for each response variable, the grand intercept must be excluded, and to
>> allow for separate slopes, the fixed effects covariates should be added
>> only by interacting them with the indicator variable. Note that the
>> response is assumed to be a multivariate normal.
>>
>> Here is an example:
>>
>> ---------------------------
>> ID  Indic   Y   X1
>> 1     1     150  22
>> 1     2      70   33
>> 2     1     180  24
>> 2     2      72   48
>> 3     1     163    2
>> 3     2      62   23
>> .              
>> .              
>> .              
>> N
>> ---------------------------
>>
>> where
>>
>> ID = identification number, repeating for each unit
>> Indic = indicator of the dependent variables (i.e. 1=height, 2=weight)
>> Y = value on that specific dependent variable (i.e. in inches for height,
>> in pounds for weight)
>> X1 = fixed effects covariate
>> ---------------------------
>>
>> The code to run such a model would be as follows:
>>
>> MIXED Y BY Indic WITH X1
>>  /FIXED=Indic Indic*X1 | NOINT SSTYPE(3)
>>  /METHOD=REML
>>  /PRINT=DESCRIPTIVES SOLUTION
>>  /RANDOM=INTERCEPT | SUBJECT(ID) COVTYPE(VC).
>>
>> ----------------------------
>>
>> Here are a couple of articles that explain running a multivariate analysis
>> in linear mixed modeling:
>>
>>
>> http://www2.sas.com/proceedings/sugi23/Stats/p229.pdf
>>
>> http://arxiv.org/ftp/arxiv/papers/0705/0705.0568.pdf 
>>
>> ----------------------------
>>
>> ***Here's a more eloquent explanation in the SAS google group that I read
>> earlier on when learning the how to run such an analysis in SAS:
>>
>> http://listserv.uga.edu/cgi-bin/wa?A2=ind0402D&L=sas-l&P=R20058
>>
>>
>> ----------------------------
>>
>> I welcome thoughts on this topic.
>>
>> Best,
>>
>> Ryan
>
>
>
>
>
> -----
> --
> Bruce Weaver
> [hidden email]
> http://sites.google.com/a/lakeheadu.ca/bweaver/
>
> "When all else fails, RTFM."
>
> NOTE: My Hotmail account is not monitored regularly.
> To send me an e-mail, please use the address shown above.
>
> --
> View this message in context: http://spssx-discussion.1045642.n5.nabble.com/Multivariate-Analysis-in-MIXED-tp1092023p5730884.html
> Sent from the SPSSX Discussion mailing list archive at Nabble.com.
>
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=====================
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--
Bruce Weaver
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http://sites.google.com/a/lakeheadu.ca/bweaver/

"When all else fails, RTFM."

PLEASE NOTE THE FOLLOWING: 
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