About combining multiple test statistics, Wikipedia says
This Z-score (for the overall meta-analysis) is appropriate for one-sided right-tailed p-values; minor modifications can be made if two-sided or left-tailed p-values are being analyzed.
What are those minor modifications?
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asked Dec 21, 2011 at 19:09
Joel W.Joel W.3,45744 gold badges3636 silver badges5050 bronze badges
$\endgroup$ 1 $\begingroup$1) If two-sided p-values are being analyzed, you use the two-sided p-value in the calculation of the $Z_i$. The two-sided p-value is $\tilde{p}_i = p_i/2$.
2) If left-tailed p-values are used, you use $1-p_i$ instead of $p_i$ in the calculation of the $Z_i$.
answered Dec 21, 2011 at 19:32
jbowmanjbowman41.7k88 gold badges7878 silver badges140140 bronze badges
$\endgroup$ 4Start asking to get answers
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