This week I have decided to focus on a scale free networks. I load the ppi network that professor Davis has provided in the class notes into Mathematica. To figure out if a ppi network is scale free you have to construct a table of p(k) versus k. You then have to plot the log of P(k) and the log of k. If the plot shows a straight line then it is a scale free network. 
This is a table of P(k) versus k. Lets see a graph of log(P(k)) and log(k).
From this plot we can see there is no straight line meaning this is not a scale free network.
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