在看WGCNA的時候看到的一個術語。網絡
先來看一個隨機網絡:沒有中心節點,大部分節點都均勻的連在一塊兒。app
再看一下scale free network:大部分的鏈接都集中在少數的中心this
如何檢驗一個網絡是不是scale free network?3d
A. Log-log plot of whole-network connectivity distribution. The x-axis shows the logarithm of whole network connectivity, y-axis the logarithm of the corresponding frequency distribution. On this plot the distribution approximately follows a straight line, which is referred to as approximately scale-free topology. blog
whole network connectivity vs. corresponding frequency distributionget
若是這個是一個正態分佈,那麼咱們的網絡就是隨機網絡。 it
看兩篇文章:io
理論危機 | 無標度網絡遭到史上最嚴重質疑network