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st: Metandi- diagnostic meta-analysis- error calculating cooks distance


From   Jannik Helweg-Larsen <jhelweg@dadlnet.dk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Metandi- diagnostic meta-analysis- error calculating cooks distance
Date   Tue, 4 Jan 2011 13:37:49 +0100

I get this error message when trying to check for particularly
influential observations using Cook's distance in the user-written "
metandi"-

(*! version 2.0 May 27, 2008 @ 15:44:22-*! Author: Roger Harbord,
University of Bristol- from ssc)

predict cook, cooksd

(Cook's distance may take a few seconds...)
can't get correct log-likelihood: -292.53257 should be -292.52883
something went wrong in comprob3
r(198);

this option is described in  the help  file " help metandi postestimation"

here are the details of the preceeding command:

metandi tp fp fn tn , gllamm force

Log likelihood   = -292.52883                     Number of studies =       58
------------------------------------------------------------------------------
             |      Coef.   Std. Err.      z    P>|z|     [95% Conf. Interval]
-------------+----------------------------------------------------------------
Bivariate    |
  E(logitSe) |   3.193061   .3660945                      2.475529    3.910593
  E(logitSp) |   2.778581   .1697863                      2.445806    3.111356
Var(logitSe) |   3.500023   1.119598                       1.86976    6.551729
Var(logitSp) |   1.228446   .2987694                      .7626685    1.978682
Corr(logits) |    .125947   .1731381                     -.2147968    .4393568
-------------+----------------------------------------------------------------
HSROC        |
      Lambda |   6.067654   .4230199                       5.23855    6.896757
       Theta |  -.5761287   .2738926                     -1.112948    -.039309
        beta |  -.5235099   .2009043    -2.61   0.009     -.917275   -.1297448
     s2alpha |   4.669403   1.167692                      2.860216    7.622965
     s2theta |    .906194   .2587435                      .5178209    1.585853
-------------+----------------------------------------------------------------
Summary pt.  |
          Se |   .9605723   .0138651                      .9224084    .9803647
          Sp |   .9415074   .0093503                      .9202542    .9573588
         DOR |   392.1493   164.3919                      172.4335    891.8286
         LR+ |   16.42211   2.660188                      11.95485    22.55867
         LR- |   .0418772   .0147754                      .0209725     .083619
       1/LR- |   23.87936   8.425298                      11.95901    47.68152
------------------------------------------------------------------------------
Covariance between estimates of E(logitSe) & E(logitSp)   .0064411

Using Stata 11 11.1 MP Win, fully updated

thanks

-- 
Jannik Helweg-Larsen M.D., DMSci
Department of Infectious Diseases, Section M5132
The Finsen Centre
Rigshospitalet
Copenhagen University Hospital
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