At 06:02 27/06/2009, sdzhangping wrote:
Dear R users:
In the example of meta-analysis (cochrane, package rmeta), I can not
found the p-value of Test for overall effect, and some other indices
(Z, I, weight and et al). How can I get the these indices listed?
> library(rmeta)
> data(cochrane)
> cochrane
name ev.trt n.trt ev.ctrl n.ctrl
1 Auckland 36 532 60 538
2 Block 1 69 5 61
3 Doran 4 81 11 63
4 Gamsu 14 131 20 137
5 Morrison 3 67 7 59
6 Papageorgiou 1 71 7 75
7 Tauesch 8 56 10 71
> a=meta.MH(n.trt,n.ctrl,ev.trt,ev.ctrl,names=name,data=cochrane)
If at this point you do str(a) you will find what a contains which
may or may not help you answer your question.
Similarly str(summary(a)) may also be revealing.
Of course R lets you do anything you want but if the author did not
print out a test and a p-value you might like to ask yourself whether
that suggests anything (as someone has already pointed out in another reply).
> summary(a)
Fixed effects ( Mantel-Haenszel ) meta-analysis
Call: meta.MH(ntrt = n.trt, nctrl = n.ctrl, ptrt = ev.trt, pctrl = ev.ctrl,
names = name, data = cochrane)
------------------------------------
OR (lower 95% upper)
Auckland 0.58 0.38 0.89
Block 0.16 0.02 1.45
Doran 0.25 0.07 0.81
Gamsu 0.70 0.34 1.45
Morrison 0.35 0.09 1.41
Papageorgiou 0.14 0.02 1.16
Tauesch 1.02 0.37 2.77
------------------------------------
Mantel-Haenszel OR =0.53 95% CI ( 0.39,0.73 ) (where is Z and p-value ?)
Test for heterogeneity: X^2( 6 ) = 6.9 ( p-value 0.3303 )
Thanks
Yours Ping Zhang
[[alternative HTML version deleted]]
Michael Dewey
http://www.aghmed.fsnet.co.uk
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