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st: RE: kappa agreement standard errors


From   "Martin Weiss" <martin.weiss1@gmx.de>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: kappa agreement standard errors
Date   Tue, 8 Dec 2009 20:36:06 +0100

<>

Easy answer: One is part of official Stata (-kap-), the other one is not
(-findit kapci-)...


HTH
Martin

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Weichle, Thomas
Sent: Dienstag, 8. Dezember 2009 20:24
To: statalist@hsphsun2.harvard.edu
Subject: st: kappa agreement standard errors

Hi Statalisters,
I am wondering why the calculation of the standard errors is different
for the kap command vs. the kapci command.

. kapci dual_15_85_6mp_dx dual_15_85_dx_12mth, tab

    Health |
 Care Dual |
      User | Health Care Dual User
  (15%<=VA |       (15%<=VA
Reliance<= |    Reliance<=85%)
      85%) |         0          1 |     Total
-----------+----------------------+----------
         0 |     1,395        118 |     1,513 
         1 |       261        158 |       419 
-----------+----------------------+----------
     Total |     1,656        276 |     1,932 


                                         N=1932
------------------------------------------------
 Kappa (95% CI) = 0.341 (0.290 - 0.393)    (A)
------------------------------------------------
 A = analytical 

. help r()

. return list

scalars:
              r(kappa) =  .3411969207847029
              r(lb_an) =  .2896667786271169
              r(ub_an) =  .3927270629422889
             r(prop_e) =  .7022330671398995
             r(prop_o) =  .8038302277432712
                 r(se) =  .0262913719660408
                  r(z) =  1.959963984540054
                  r(N) =  1932

. kap dual_15_85_6mp_dx dual_15_85_dx_12mth

             Expected
Agreement   Agreement     Kappa   Std. Err.         Z      Prob>Z
-----------------------------------------------------------------
  80.38%      70.22%     0.3412     0.0220      15.48      0.0000

. return list

scalars:
                 r(se) =  .0220367175735475
                  r(z) =  15.48310993440647
              r(kappa) =  .3411969207847029
             r(prop_e) =  .7022330671398995
             r(prop_o) =  .8038302277432712
                  r(N) =  1932

Tom Weichle
Math Statistician
Center for Management of Complex Chronic Care (CMC3)
Hines VA Hospital, Bldg 1, C202
708-202-8387 ext. 24261
Thomas.Weichle@va.gov 

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