Dear Janet,
If I understand your problem, you have 50 patients, and each is measured six
times: 4 times with method 1 and 2 times for method 2.
If you want to know if the two methods agree, you have to use Bland & Altman
method for repeated measurements.
You will find this method in
Bland M., Altman D. "Measuring agreement in method comparison studies" .
Statistical Methods in Medical Research 1999;8:135-160
Anova will not help you to test agreement.
Hope this helps.
Alvine Bissery
-----Message d'origine-----
De: Janet Oliver [mailto:[email protected]]
Date: vendredi 20 juin 2003 15:26
�: [email protected]
Objet: st: Re: Repeated Measurements
I have 4 repeat measurements on a variable 2 using method 1 and 2 using
method 2 over 50 patients. I was going to take mean values and then use
either Lin's concordance or Bland-Altman to compare them. However it strikes
me that I might be losing information doing this and that using repeated
measures anova might be more useful. Unfortunately I cannot work out the
correct syntax.
anova sn pat x, repeated(x) does not take into account that the values 1 & 2
of x refer to method 1 and 3,4 refer to method 2.
I would be grateful for some advice on the syntax - or the appropriateness
of this approach.
Janet
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