A study is being designed to assess use of pre-exposure prop…
A study is being designed to assess use of pre-exposure prophylaxis in men who have sex with men. The researchers decide to first recruit 5 eligible participants, and to then have these 5 participants help recruit other potentially eligible individuals from their social circles. The researchers give each of the first 5 eligible participants numbered coupons to hand out to other potentially eligible individuals, and use these coupons to track how each participant was recruited. Models are then built of the recruitment networks (based on coupons returned to researchers), and these models are used to estimate biases related to network density and homophily. This scenario best describes a __________ approach.