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Re: st: New to Stata; wish to calculate sample size for kappa


From   volsmd99 <volsmd99@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: New to Stata; wish to calculate sample size for kappa
Date   Mon, 2 May 2011 20:59:38 -0400

My goal is to calculate sample size for my scenario. I should mention that in addition to being new to stata, i am also new to kappa.

For my case, I had the raters look at a video for which they could classify their opinion into three categories. Their choices were 0, 1, or 2. 

My Ko value is 0.80 (the level at which I considered Kappa to be significant)  and my KL is 0.60 (minimum threshold value). Supposing a 95% confidence interval, I wish to calculate sample size. 

I have come across the package sskdlg but it seems to only allow sample size calculation with a binary outcome and with only two raters.

thanks 


On May 2, 2011, at 3:12 PM, Steven Samuels wrote:

> Welcome to Stata and Statalist!
> 
> I don't really understand your question. If you have a number of raters and one subject,  you can estimate the proportion of raters who assign each category to the subject. Call them p1, p2, p3, with p1 + p2 + p3 =1.  How is kappa to be defined?
> 
> Steve
> sjsamuels@gmail.com
> 
> 
> 
> On May 1, 2011, at 7:24 PM, volsmd99 wrote:
> 
> Hi,
> 
> I was previously a user of SAS and have recently switch to stata.
> 
> My situation involves multiple raters on a 3 point ordinal scale. I have one subject. I am unsure which or if there is a package that will allow me to do this.
> 
> thanks, George
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