Joint Probability Distribution Average Degree <k>=2M/N Degree Distribution (k)=m(k)/N(k)=∑Pk) Joint Probability Distribution: prob. to find a node with degree j and k at the two ends of a randomly selected link PU,k) (j,k) 2M ≠A)(,)=m(元,j P(,k)=m(,k)(jk) 2MJoint Probability Distribution   = k M N 2 / P k n k N ( ) ( ) / = 0 ( ) k k kP k  = =  ( , ) ( , ) ( ) 2 m j k P j k j k M =  Joint Probability Distribution: prob. to find a node with degree j and k at the two ends of a randomly selected link Average Degree Degree Distribution ( , ) ( , ) ( , ) 2 m j k j k P j k M  = ( , ) ( , ) m j j P j j M =