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Re: st: Calculating Percent Agreement


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Calculating Percent Agreement
Date   Thu, 14 Feb 2013 18:53:22 +0000

Reverse engineering the definition of % agreement from your examples,
your results can be reproduced by

gen agree = .

di

foreach var in q1 q2 q3 {
	qui bysort obs : replace agree = (`var'[1] == `var'[2]) if _n == 1
	su agree, meanonly
	di "`var': % agreement  " %4.1f  100 * r(sum) / r(N)
}

apart from the fact that 2/3 rounds to 67%,  not 66%.

If you want anything inferential too, this code is clearly not sufficient.

Nick

On Thu, Feb 14, 2013 at 6:20 PM, Lynne Morgan <lmorgan3@wisc.edu> wrote:

> I have a data set based on a questionnaire similar to the one below. There
> are two entries for each object because each was rated twice. We would like
> to look at the percent agreement between the two questions but there were
> several raters so we just want to look at the differences for each question.
> In this case, I want to calculate that q1 has a % agreement of 66%, q2
> agreement= 33% and q3 % agreement=100%.
>
> Because it is not by rater, I can't use the stata kappa command or kap. What
> is the best way to calculate this in stata? Or, what is the best way to
> transpose the data in order to use kappa?
>
> obs q1    q2    q3    dup
> 1    0        0     0         1
> 1     0       1     0         2
> 2     0       1     1         1
> 2     1       1     1         2
> 3    1        0     1         1
> 3    1        1     1         2
>
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