Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down on April 23, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: AW: Non-reported s.e. for kappa
Date   Wed, 14 Apr 2010 16:52:20 +0200

<> 

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)

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



The Institute of Cancer Research: Royal Cancer Hospital, a charitable
Company Limited by Guarantee, Registered in England under Company No. 534147
with its Registered Office at 123 Old Brompton Road, London SW7 3RP.

This e-mail message is confidential and for use by the addressee only.  If
the message is received by anyone other than the addressee, please return
the message to the sender by replying to it and then delete the message from
your computer and network.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   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   |   Site index