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st: Re: Midas univariable regression


From   NELE BRUSSELAERS <lonnb6@student.london.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: Midas univariable regression
Date   Tue, 7 Feb 2012 17:22:25 +0100

Hi,

I'm using the user-written midas command (Stata v11.2 - Mac), but I do
have a question considering the interpretation of the univariable
regression model...

Why is the p-value of the pooled sensitivity of var1 and var2 so high?
The 95% confidence intervals are clearly not overlapping, so I would
expect that this is 'strong' evidence that both sensitivities are
different....
I hope someone can help me out! Thanks!

Nele

. midas tp fp fn tn, reg(var1 var2 var3)



Estimating Covariate Effect Of:  var1



Estimating Covariate Effect Of:  var2



Estimating Covariate Effect Of:  var3



Sensitivity and Specificity


| Parameter   category nstudies Sensitivity      p1     Specificity
      p2   |
--------------------------------------------------------------------------------|
  | var1      Yes   22   0.79 [0.74 - 0.85]   0.24   0.96 [0.94 - 0.98]   0.00 |
  |           No    25   0.65 [0.57 - 0.72]   .      0.90 [0.86 - 0.95]   .    |
  | var2      Yes   34   0.78 [0.73 - 0.83]   0.54   0.96 [0.94 - 0.98]   0.03 |
  |           No    15   0.61 [0.52 - 0.69]   .      0.87 [0.82 - 0.93]   .    |
  | Var3      Yes   11   0.80 [0.71 - 0.89]   0.20   0.97 [0.94 - 1.00]   0.10 |
  |           No    38   0.71 [0.65 - 0.77]   .      0.93 [0.91 - 0.96]   .    |
  +-----------------------------------------------------------------------------------------+


Joint Model


  +------------------------------------------------------------+
  | Parameter   category   LRTChi2   Pvalue   I2   I2lo   I2hi |
  |------------------------------------------------------------|
  | var1        Yes        19.94     0.00     90   80     100  |
  |                No         .         .        .    .      .    |
  | var2        Yes        17.18     0.00     88   76     100  |
  |                No         .         .        .    .      .    |
  | var3        Yes        3.53      0.17     43   0      100  |
  |                 No         .         .        .    .      .    |
  +------------------------------------------------------------+
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