How to prevent bots and farms from taking over and ruining your online experiment

In this post, I share simple techniques to filter participants before they take part in your online experiment. These techniques filter bots and participants using automated scripts plus participants who fake their geolocation using VPN/VPS, proxies, and server farms.

The best time to pick up oTree (to design interactive experiments) is now!

Over the past few months, oTree has undergone changes making it much easier to design your (online) interactive experiment. Find out what changed!

Deception when generating random numbers

Many experiments generate random numbers for participants. Yet, the code used to generate those numbers sometimes does not do what we think it does, which could lead to deception when reporting about the number generation process to participants.