Since my experiment is going to be about 20 minutes per participant, and it’s a rather difficult cognitive task, I expect issues with high participant attrition. To try and counteract that, I decided to incentivize the participants by using a lottery system of giving out 10 cash prizes (200 of my local currency) to those that complete the entire study.
However, I also need participants to share the link to the study to as many people as possible, and this comes with a disincentive due to the fact that the more participants the study has, the less likely the participant is to win the prize. I believe this will make it less likely for people to share and recommend participation in the study to others.
To counteract that disincentive, I want to use some kind of a referral system, where I could offer a “referral link” to a participant after he completes the study, and if someone wins the prize, whoever referred him would also get a consolation prize (50 of the local currency).
My question is, does anyone have an idea as to how to set up a referral system? Is there an option for that using PsychoPy/Pavlovia? If not, can anyone suggest a workaround, or a different idea to counteract such disincentives?