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Re: st: AW: Non-reported s.e. for kappa


From   "Karen Wright" <Karen.Wright@icr.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   Re: st: AW: Non-reported s.e. for kappa
Date   Wed, 14 Apr 2010 16:02:45 +0100

The help file does state that the standard error is returned though
which is what confused me!  Sorry for bothering the list about it, thank
you for your response.
Karen

>>> "Martin Weiss" <martin.weiss1@gmx.de> 14/04/2010 15:52 >>>

<> 

You do not need an imaginary dataset, as the official example does not
return the se, either:


*************
webuse p615, clear
kap cat*
ret li
*************

The help file could make this fact clear, I think. BTW, a command
reporting
a whole table inevitably runs into the problem which statistics it
should
return. Just see what -summ- with a -varlist- hands back: The
statistics for
the last variable in that -varlist-. The alternative would be to return
a
-matrix-, of course...


HTH
Martin


-----Ursprüngliche Nachricht-----
Von: owner-statalist@hsphsun2.harvard.edu 
[mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Karen
Wright
Gesendet: Mittwoch, 14. April 2010 16:38
An: statalist@hsphsun2.harvard.edu 
Betreff: st: Non-reported s.e. for kappa

Dear All,
I have been working with kappa statistics and I have come across a
peculiarity that I don't fully understand.  Searching the help files
and the
statalist archive did not shed any light on the matter unfortunately.
After running a simple composite kappa on multiple readers (3
categories)  I
then type -di r(se)- and obtain nothing!  The results have not been
cleared
from memory as typing -di r(kappa)- displays the kappa value.  Does
anyone
know why this is?
I am aware that test statistics cannot be calculated when the number
of
ratings per subject vary.  Is there something similar happening here?!

I have shown below a snippet of the data and the commands used. 
Snippet of
data contains the diagnosis (=1,2, or 3) for 6 readers (id2-id10) on 5
cases.  [Done using Stata10 on Windows.]

Thank you for taking the time to read this,
Karen

*************************************************
version 10.0

input case id2 id3 id6 id8 id9 id10
1 3 3 3 3 3 3
2 1 1 1 1 1 1
3 2 2 1 3 1 1
4 3 3 3 3 3 3
5 1 1 1 1 1 1
end

kap id*
di r(se)
di r(kappa)

*************************************************



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