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


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: AW: Non-reported s.e. for kappa
Date   Wed, 14 Apr 2010 13:34:47 -0400

Karen was apologizing for calling me "Martin" in a  previous post, I believe.
-Steve

On Wed, Apr 14, 2010 at 1:26 PM, Martin Weiss <martin.weiss1@gmx.de> wrote:
>
> <>
>
> " 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.
>>>>
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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
>
> *
> *   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/
>



-- 
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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*   http://www.ats.ucla.edu/stat/stata/


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