Dear all,
I have a dataset with 2 radiologists, rating 40 different patients.
I need the Kappa and the IC.
For the IC, I try to get it by bootstrap method.
My dataset is like this:
Sujet Rad1 Rad2
1 1 0
2 0 1
3 1 1
.
.
40 0 0
I get always this error message : "last estimates not found
r(301);"
, when I give this syntax:
. bootstrap "kap rad1 rad2" _se, reps(30) noisily size(39)
bootstrap: First call to (kap rad1 rad2) with data as is:
. kap rad1 rad2
Expected
Agreement Agreement Kappa Std. Err. Z Prob>Z
-----------------------------------------------------------------
64.10% 49.90% 0.2835 0.1593 1.78 0.0376
last estimates not found
r(301);
Where is my mistake ??
Alvine Bissery
-----Message d'origine-----
De: Agn�s Sommet [mailto:[email protected]]
Date: mercredi 19 mars 2003 16:11
�: [email protected]
Objet: st: <aucun objet>
Hello Statalisters,
I'm trying to make a case-control study dataset from a larger dataset, and
I'd like to match cases and controls with respect to categorical variables.
I was very interesting by the sttocc command, but I don't use survival-time
data.
Is there a similar command to create a matched case-control dataset?
Can anyone help me?
Thank you
Agnes Sommet
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