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st: META with confidence intervals


From   "Paul O'Brien" <paul.obrien@afe2.org.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: META with confidence intervals
Date   Tue, 29 Oct 2002 09:11:44 +0000

Title: META with confidence intervals
I am combining two studies:

Study       RR    LCI   UCI
Study 1   0.7   0.1   8.2
Study 2   0.6   0.1   6.4

With the command:

. meta rr ll ul, ci eform gr(f) print id(study)  

However, the confidence intervals listed in the print are different from what I have entered:

Meta-analysis (exponential form)
       |  Pooled      95% CI         Asymptotic      No. of
Method |     Est   Lower  Upper  z_value  p_value   studies
-------+----------------------------------------------------
Fixed  |      0.645   0.142   2.927   -0.568    0.570      2
Random |   0.645  0.142   2.927   -0.568    0.570
Test for heterogeneity: Q=  0.010 on 1 degrees of freedom (p= 0.921)
Moment-based estimate of between studies variance =  0.000
          |      Weights      Study       95% CI
    Study |   Fixed Random    Est   Lower   Upper
----------+----------------------------------------
Study 1 |    0.79    0.79    0.70    0.08    6.34
Study 2|    0.89    0.89    0.60    0.08    4.80

What is the problem?

Thanks

Paul



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