Fig. 1
From: Association between tuberculosis in men and social network structure in Kampala, Uganda
Types of egocentric network sampling varies in the amount of information collected outward from the index individual. Index individuals, shown in yellow, list their contacts in ego-only sampling (a). In first-level egocentric sampling (b), index individuals additionally indicate whether their contacts are also contacts. In second-level egocentric sampling (c), contacts of index individuals list their own contacts. The social network in the Kampala study utilized a second-level egocentric design. We used sensitivity analyses to understand how these types of egocentric sampling designs alter estimates of network centrality statistics