EMA of Substance Use in Homeless Youth

Participants receive 3 EMA survey prompts daily for the duration of the study.

Participants receive 6 EMA survey prompts daily for the duration of the study.

"Those assigned to the fixed incentive condition will earn a fixed bonus based on EMA completion (50-74%=$3; 75-89%=$5; ≥90%=$10) each week."

"Those assigned to the prize-based incentive will be rewarded for high survey completion with increasing numbers of draws depending on their level of response to EMA prompts each week (50-74%=1 draw, 75-89%=2 draws, ≥90%=3 draws). For each draw, individuals will use the EMA app to spin the wheel to see which prize amount they earn. Out of a total of 500 total draws, 50% will be $1, 43.6% will be $3, 6% will be medium prizes ($5), and 0.4% will be a jumbo prize ($90)."