{
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  "bskyPostRef": {
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    "uri": "at://did:plc:wwyqal4cnqhuwyacdj7rqq3n/app.bsky.feed.post/3mn5mw7yiurl2"
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  "path": "/t/rms-parametric-survival-models/28766#post_5",
  "publishedAt": "2026-05-31T11:52:35.000Z",
  "site": "https://discourse.datamethods.org",
  "textContent": "How do you deal with the challenges of the proportional hazards assumption that Hernan raised? The HR is a conditional-on-survival quantity that selects on the outcome over time, by time _t_ , the surviving treated and control populations are no longer comparable even under baseline randomization. (b) The HR depends on follow-up duration; the same trial reported at 1 year, 3 years, and 5 years will produce different HRs even when the underlying biological effect is unchanged. Thank you.",
  "title": "RMS Parametric Survival Models"
}