[R] accuracy of measurements

[Denis Kazakiewicz]

Thank so much to everybody who found time to answer my question
All your messages are of great help.
Good luck

 
 
У Пят, 25/02/2011 у 05:46 -0800, Dennis Murphy піша:
> And in that vein, the recently released MethComp package by Bendix
> Carstensen may be of service.
> 
> HTH,
> Dennis
> 
> On Fri, Feb 25, 2011 at 5:39 AM, Marc Schwartz <marc_schwartz at me.com>
> wrote:
>         On Feb 24, 2011, at 4:50 PM, Denis Kazakiewicz wrote:
>         
>         > Dear R people
>         > Could you please help with following
>         >
>         > Trying to compare accuracy of tumor size evaluation by
>         different
>         > methods. So data looks like
>         >
>         > id true metod1 method2 ...
>         > 1  2  2       2.5
>         > 2  1.5        2       2
>         > 3  2  2       2
>         >
>         > etc.
>         >
>         > Could you please give a hint how to deal with that.
>         > Seems like {merror} does not suite to me because I am trying
>         to compare
>         > accuracy of measurements with their true known values not
>         just overall
>         > agreement of methods.
>         > Moreover sample size is ridiculously small (33 patients) so
>         ANOVA is not
>         > much of help (or is it?)
>         > Any suggestions, hints and even guesses are highly
>         appreciated. I am
>         > stuck a bit.
>         
>         
>         
>         Denis,
>         
>         I would suggest that you start here:
>         
>          http://www-users.york.ac.uk/~mb55/meas/meas.htm
>         
>         This covers various resources pertaining to the design and
>         analysis of measurement studies, primarily based upon methods
>         by Bland and Altman.
>         
>         HTH,
>         
>         Marc Schwartz
>         
>         
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>