SDM   Seed-based d Mapping
formerly "Signed Differential Mapping"
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SDM calculations

Jackknife sensitivity analysis

This procedure performs a jackknife analysis, which consists in repeating the mean analysis as many times as studies have been included, discarding one different study each time, i.e. removing one study and repeating the analysis, then putting that study back and removing another study and repeating the analysis, and so on. The idea is that if a significant brain region remains significant in all or most of the combinations of studies it can be concluded that this finding is highly replicable.

To conduct a jackknife analysis

Press the button [Mean]


Select [Mean] in the Statistics menu, to open the following dialog:

Dialog picture


(original algorithms): Radua J and Mataix-Cols D. Voxel-wise meta-analysis of grey matter changes in obsessive-compulsive disorder. Br J Psychiatry 2009; 195:393-402. link .