Archive for the ‘Network’ Category

Understanding dyad in ERGM

Published by chengjun on October 20th, 2012

It’s a bit difficult to understand the terms used by ERGM.

I am working on predicting how friendships influence the information diffusion using weibo landscape data with ERGM.

According to the statnet library:

With the parameter of “dyadcov” term, we add three statistics to the model, each equal to the sum of the covariate values for all dyads occupying one of the three possible non-empty dyad states (mutual, upper-triangular asymmetric, and lower-triangular asymmetric dyads, respectively).

Obviously, there are three kinds of dyads.

Check Wasserman and Faust’ book of Social Network Analysis, and I find the figure above.

 However, most of us don’t know the difference between upper-triangular asymmetric and lower-triangular asymmetric dyads.

Based on my understanding, it’s related to the direction of ties, see the figure below (am i right?):

The interactions on our bbs of web mining lab: Thread network analysis

Published by chengjun on November 19th, 2010

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the hidden pattern behind online posting behavior: take 3377 as an example

Published by chengjun on October 3rd, 2010

This is a study for fun. There was a case of flesh search called 3377. I download the whole thread and analyze the hidden pattern behind the reply behavior.

From the figures above, we can find that the number of reply is distributed as power law.

Then I use Rost software to analyze its semantic network structure.