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| 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 12:18:03 -0400 |
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 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/ >> > > > > -- > 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/