Individuals are not small groups, II: The ecological fallacy

tl;dr When people conclude results from group-level data will tell you about individual-level processes, they commit the ecological fallacy. This is true even of the individuals whose data contributed to those group-level results.

Individuals are not small groups, I: Simpson's paradox

tl;dr If you are under the impression group-level data and group-based data analysis will inform you about within-person processes, you would be wrong. Stick around to learn why.

How can process-based researchers bridge the gap between individuals and groups? Discover the dynamic p-technique

Behavioral researchers are concluding that conventional group-based analyses often mask meaningful individual differences and do not necessarily map onto the change processes within the lives of individual humans. [Hayes et al. …