2015/06/15

同じデータに2回統計をかけることについて

問題となるのは,有意水準だけなのか? というメモ。現時点では良いアイディアなし。

例1
外れ値の検定を有意水準=0.05で行ったのち,残ったデータに対してt検定 などをかける。

例2
有意でないボクセルをマスクしたbrain mapに対して,ROI analysisを行って平均値をt検定などで比較する。

どちらも,有意水準が0.95 x 0.95になってしまう点のみが問題ならば,Bonferroni補正で正当化できるはず。例2では,残ったボクセルはt分布の端の方になるので,正規分布が仮定できないという問題点もあるかもしれない。すっきりした解答がほしい。

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