Power Analysis
2 posts tagged with “Power Analysis”
Study DesignEMA
Prompt frequency, questionnaire length, and study duration: the design trade-offs that shape ESM data quality
Three upstream design choices determine how much burden an ESM participant carries and how much usable data a study produces: how many prompts arrive per day, how many items each prompt asks, and how many days the protocol runs. This post reviews what the evidence says each choice costs and buys — including the experimental finding that questionnaire length, not sampling frequency, is what degrades data quality — and covers the response window as a fourth, separate decision.
August 17, 2026
Methodology
Power analysis for intensive longitudinal designs
Why standard G*Power calculations underpower ESM studies, and how to think about effective sample size when each participant contributes many observations.
July 13, 2026