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  "path": "/t/power-calculations-in-longitudinal-mixed-effects-from-two-measurements-to-three-measurements/28699#post_2",
  "publishedAt": "2026-04-09T15:17:16.000Z",
  "site": "https://discourse.datamethods.org",
  "tags": [
    "most natural way to model longitudinal data",
    "here"
  ],
  "textContent": "Side note: random effects are not the most natural way to model longitudinal data, and when you use random intercepts, adding more than around 7 repeats within subject adds no statistical information. That’s partially because random intercepts means compound symmetric correlation structure which means that time is not treated as directional. I learned this from here. The bottom line is that random effects are not likely to fit the true correlation structure.",
  "title": "Power Calculations in Longitudinal Mixed Effects - from two measurements to three measurements"
}