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


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: AW: Non-reported s.e. for kappa
Date   Wed, 14 Apr 2010 19:26:44 +0200

<>

" I'm flattered to be mistaken for Martin."


Where is the mistake? Karen`s first sentence was for you, the second one for
me.


HTH
Martin


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Steve Samuels
Sent: Mittwoch, 14. April 2010 19:24
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: AW: Non-reported s.e. for kappa

You are welcome, Karen.  I'm flattered to be mistaken for Martin.
With n = 26, you might also try -bootstrap-.

Steve

On Wed, Apr 14, 2010 at 12:20 PM, Karen Wright <Karen.Wright@icr.ac.uk>
wrote:
> Deepest apologies, thanks Steve for the jackknife suggestion.
> Although thanks also to Martin for your input!
>
>>>> Steve Samuels <sjsamuels@gmail.com> 14/04/2010 17:18 >>>
> Correction, to get the pseudo-values _jk_1:
>
> jackknife r(kappa), mse keep: kap id*
> ci _jk_1      // First order unbiased estimates
>
>
> Steve
> On Wed, Apr 14, 2010 at 12:03 PM, Steve Samuels <sjsamuels@gmail.com>
> wrote:
>> Martin-
>> For Karen's set up (idj contains the subject rating for  rater j),
>> there is no official example that I can see. p615 shows counts of
>> ratings, with each variable being a rating category.  Also, for
> p615,,
>>  the command should be "kappa",  not "kap", because the data are
>> counts of assignments to three categories by five raters. This was
>> terrible  syntax decision: depending on the use of "kap" or "kappa"
> to
>> distinguish between two data setups.
>>
>> One suggestion for a standard error:
>> *************************************************
>> version 10.0
>> clear
>>  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*
>> jackknife r(kappa), mse: kap id*
>> ci _jk_1      // First order unbiased estimates
>> *************************************
>>
>>  n = 5 subjects doesn't seem like enough to draw many conclusions.
>> It's interesting that the raters disagreed for only one subject.
>>
>> Steve
>>
>> Steve
>>
>> On Wed, Apr 14, 2010 at 10:52 AM, Martin Weiss <martin.weiss1@gmx.de>
> wrote:
>>>
>>> <>
>>>
>>> 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
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>>
>>
>>
>> --
>> Steven Samuels
>> sjsamuels@gmail.com
>> 18 Cantine's Island
>> Saugerties NY 12477
>> USA
>> Voice: 845-246-0774
>> Fax:    206-202-4783
>>
>
>
>
> --
> Steven Samuels
> sjsamuels@gmail.com
> 18 Cantine's Island
> Saugerties NY 12477
> USA
> Voice: 845-246-0774
> Fax:    206-202-4783
>
> *
> *   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/
>
> 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/
>



-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783

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