グラフ理論，絶対閾値できっちゃだめ， 相対閾値（コスト，ネットワーク密度）できろうね。

Neuroimage. 2015 Sep;118:651-61. doi: 10.1016/j.neuroimage.2015.05.046. Epub 2015 May 27.
The (in)stability of functional brain network measures across thresholds.
Garrison KA1, Scheinost D2, Finn ES3, Shen X2, Constable RT4.

めんどいのでハイライトをコヒペ。
Network measures were found to be unstable across absolute thresholds.
For instance, the direction of significant group differences can reverse across thresholds.
Network measures were found to be more stable across proportional thresholds.
Caution should be used when applying thresholds to functional connectivity data.