Measures
We focused on individuals who were assessed with the Center for Epidemiological Studies depression scale (CES-D) in 1983-2003 at times corresponding to the 5th, 6th, and 7th examinations of the offspring cohort. The median year of examination for these individuals was 1986 for exam 5, 1996 for exam 6, and 2000 for exam 7.
To test whether clustering of happy and unhappy people in the network is due to chance, we compared the observed clustering to the clustering in 1000 randomly generated networks in which we preserved the network topology and the overall prevalence of happiness but in which we randomly shuffled the assignment of the happiness value to each node.46 If clustering is occurring, then the probability that an alter is happy given that an ego is happy should be higher in the observed network than in the random networks.Continue Reading..
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