An edge is a link between two people or entities in a network that can be
directed or undirected. A directed edge has a clear origin and destination: lender > borrower, tweeter > follower. An undirected edge connects two people or entities with a mutual relationship: Facebook friends, teams in a sports league.
"The course was very good and well presented. The material in the notes was self-explanatory for a non-technical person, and the supplementary book provided good reading for the person who is interested in more technical details."
Gichangi, Dept. of Statistics, Univ. of Southern Denmark (doctoral student)
"I just completed another of your courses and yours is without question the best online educational resource available."
L. Crawley, Stanford University
"This course could serve as a model in the field."
G. Vidmar, Biostatistician, University of Ljubljana
"Good value for the money. Thank you very much for a thought- provoking course"