Stata Technical Bulletin
STB-57
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Saved results
tsmktim saves the items returned by tsset in r().
sbe19.2 Update of tests for publication bias in meta-analysis
Thomas J. Steichen, RJRT, [email protected]
Abstract: Enhancements, changes, and a new option for metabias are described.
Keywords: publication bias, meta-analysis.
This insert documents enhancements and changes to metabias and provides the syntax needed to use a new feature. A full
description of the method and of the operation of the original command and options are given in Steichen (1998). A few revisions
were documented later in Steichen et al. 1998. This updated program does not change the implementation of the underlying
statistical methodology or modify the original operating characteristics of the program; rather, it follows the syntax changes of
Stata version 6.0.
New option
gweight requests that the graphic symbols representing the data in the plot be sized proportional to the inverse variance.
Description
The primary purpose of this version is to revise metabias to meet and to exploit syntax changes in Stata version 6.0. In
addition, some minor deficiencies in the previous implementation have been corrected.
First, metabias previously failed to allow a stratified Egger analysis to report a result for the remaining usable strata when
one or more strata had undefined slopes, instead it reported a missing overall estimate. Such a limitation is not necessary and
has been fixed.
Second, option gweight has been added to allow the graphic symbols to be sized according to the data point’s inverse
variance weight in the optional funnel plot.
Finally, saved results are additionally returned in r(). They are documented below.
Saved Results
The system S_# macros are unchanged. In addition, the saved results are returned in r(). Specifically, metabias saves:
|
S-I |
r(k) |
number of studies |
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S-2 |
r (score) |
Begg’s score |
|
S-3 |
r(score,sd) |
standard deviation of Begg’s score |
|
S-4 |
r (Begg-p ) |
Begg’s p value |
|
S _5 |
r(Begg-pcc) |
Begg’s p, continuity corrected |
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S-6 |
r (Egger _bc) |
Egger’s bias coefficient |
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S-7 |
r (Egger _p) |
Egger’s p value |
|
S _8 |
r(effect) |
overall effect (log scale) |
References
Steichen, T. J. 1998. sbe19: Tests for publication bias in meta-analysis. Stata Technical Bulletin 41: 9-15. Reprinted in Stata Technical Bulletin
Reprints vol. 7, pp. 125-133.
Steichen, T. J., M. Egger, and J. Sterne. 1998. sbe19.1: Tests for publication bias in meta-analysis. Stata Technical Bulletin 44: 3-4. Reprinted in
Stata Technical Bulletin Reprints vol. 8, pp. 84-85.
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