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st: combining reliability trial data


From   Hilary Taylor <Hilary.Taylor@bristol.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: combining reliability trial data
Date   Mon, 13 Feb 2012 16:26:59 +0000

Hi,

I am hoping to test the inter- and intra-rater variance of a measurement method. I had two raters (R1 and R2) perform measurements on 28 items and each rater measured the set twice (t1 and t2). The measurements are scale.

I have drawn up some Bland & Altman plots and have performed Pitman's tests. I have carried this out for inter-rater (R1t1 vs R2t1) and intra-rater (R1t1 vs R1t2), however I would really like to combine the data somehow to make use of it all. I thought the command 'bagroup' (Paul Seed, 2000) might be useful but have been unable to explore this because the following error comes up:

bagroup  t1_r1  t2_r1  t1_r2  t2_r2
program error:  matching close brace not found

I would be grateful if you could tell me firstly, if this would be a useful thing to do (if I can get it working) and secondly, if you have any suggestions for a better way for me to combine these data (I would like to create plots and associated stats)?

(I am using Stata/SE 11.2)

Thanks

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