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Association between 
and homophily by gender, race, age, HIV positive status and sharing syringes among IDU in 43 RDS samples in NHBS-IDU1 and NHBS-IDU2. Poly (IDU1) and Poly (IDU2) are the non-linear best fit lines for NHBS-IDU1 and NHBS-IDU2, respectively. Linear fit lines were tested and ruled out when residual plots showed clear nonrandom patterns
