Table 2. Definitions of social association parameters.

Parameter	Definition
Social differentiation (S)	S is the proportion of time spent together between individuals and a measure of social structure variability. S value of less than 0.3 indicates a homogenous society, greater than 0.5 indicates a well-differentiated society, and greater than 2 indicates extremely differentiated societies in the population (Whitehead, 2009).
Correlation between true and estimated association indices (r)	r represents the power of the result to detect the true social system. A value less than 0.4 indicates a general result, greater than 0.8 indicates a reliable result (Whitehead, 2008b).
Modularity (Q)	Q, for a defined set of clustered individuals, is the difference between the observed and expected proportion of associations within clusters. A modularity value above 0.3 indicates a credible result for individuals divided into their respective communities (Newman, 2004).