Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, is already up and running.

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

re: st: repeated measures

From   "Airey, David C" <>
To   "" <>
Subject   re: st: repeated measures
Date   Wed, 27 Feb 2013 14:16:51 +0000


Sounds like you tried some models and anova complained about the bse term.

I find the description a little hard to follow. What is a multiplex test? What are the outcome/dependent variables and measures? What are the predictors? What was the study design? It sounds complicated. Were the measures "resulta_1" and "resulta_2" replicates at the same time (technical replicates you would be willing to average because they represent trying to get a better measure) or were they collected at different times (you were interested in change over time in those measures)?

If you used -anova- or -xtmixed- you would need to reshape your data to long format.

-manova- and -sem- would allow analysis of repeated measures in wide format.


> I have a dataset that includes results from a multiplex test by 2
> collection methods, and a criterion standard result for each
> collection method. In wide form, by subject, it looks like this:
> subject resulta_1 resultb_1 resultc_1 criterion_1 resulta_2 resultb_2
> resultc_2 criterion_2
> In order to assess the effect of each result as predictor of the
> criterion standard, I know that I have to adjust for non-independence
> of the observations, but how do I do that for the outcome?  I would
> use repeated measures ANOVA, but the dependent variable is also
> repeated.  And what would be my bse term??
> A little lost.  Thank you
> --
> Harrison Alter, MD, MS, FACEP

*   For searches and help try:

© Copyright 1996–2016 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index