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Beware of ceiling effects when testing for moderation: is intergroup contact really more effective for authoritarians?

TL;DR Moderation tests identify whether the link between a predictor and an outcome depends on the level of another variable. Spurious results are likely to appear when a) the predictor is influenced by floor or ceiling effects and b) predictor and moderator are correlated (recently pointed out by Rohrer and Arslan 2021, Box 1).

Quickly expand your capacity: run Python script on Google Cloud

I am currently working on some simulation studies using agent-based models, which can quickly take a very long time to run. Rather than having my system slowed for hours/days, I wanted to find a way to quickly send code into the cloud.