[R] Bland-Altman method to measure agreement with repeated measures

[Marc Schwartz]

on 07/05/2008 03:17 AM kende jan wrote:
> Dear all,
> 
> I want to use the Bland-Altman method to measure agreement with
> repeated measures collected over period of time (seven periods).
> 
> How can I do this with R
> 
> 
> Many thanks
> 


The following links should be helpful from a design/methodology perspective:

   Comparing within-subject variances in a study to compare two methods
   of measurement
   http://www-users.york.ac.uk/~mb55/meas/compsd.htm


   Agreement between methods of measurement with multiple observations
   per individual
   http://www-users.york.ac.uk/~mb55/meas/ba2007.htm


and perhaps more generally:

   http://www-users.york.ac.uk/~mb55/meas/comfaq.htm


You will need to provide more detail on your experimental design and 
data for any R specific guidance, which could feasibly include the use 
of mixed effects models where subject is a random effect. In the latter 
case, there is a R e-mail list focused on that approach:

   https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models

HTH,

Marc Schwartz