Stata The Stata listserver
[Date Prev][Date Next][Thread Prev][Thread Next][Date index][Thread index]

st: bootstrap and kappa


From   BISSERY Alvine <Alvine.BISSERY@hop.egp.ap-hop-paris.fr>
To   statalist@hsphsun2.harvard.edu
Subject   st: bootstrap and kappa
Date   Tue, 25 Nov 2003 11:23:23 +0100

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: Agnès Sommet [mailto:a.sommet@free.fr]
Date: mercredi 19 mars 2003 16:11
À: statalist@hsphsun2.harvard.edu
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 
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/

*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/



© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   What's new   |   Site index