# \#categorization

**URL:** https://discourse.datamethods.org/tag/categorization/116.md

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## [Dichotomization](https://discourse.datamethods.org/t/dichotomization/26337)

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**Author:** [@EvZ](https://discourse.datamethods.org/u/EvZ)\
**Replies:** 91\
**Last updated:** [October 10, 2026, 7:04pm UTC](https://discourse.datamethods.org/t/dichotomization/26337 "2026-10-10T19:04:07Z")

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I’m writing a paper about “An Empirical Assessment of the Cost of Dichotomization” together with Frank Harrell (@f2harrell) and Stephen Senn (@Stephen). In this paper, we quantify the information loss due to dichotomizat…

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## [Categorizing Continuous Variables](https://discourse.datamethods.org/t/categorizing-continuous-variables/3402)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 29\
**Last updated:** [December 24, 2024, 8:56am UTC](https://discourse.datamethods.org/t/categorizing-continuous-variables/3402 "2024-12-24T08:56:12Z")

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Problems Caused by Categorizing Continuous Variables References | Key reference | Key Reference for Response Variables | More References | Myths About Risk Thresholds | Dichotomania Optimum decisions are made by applyin…

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## [Responder Analysis: Loser x 4](https://discourse.datamethods.org/t/responder-analysis-loser-x-4/1262)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 22\
**Last updated:** [January 9, 2025, 9:07pm UTC](https://discourse.datamethods.org/t/responder-analysis-loser-x-4/1262 "2025-01-09T21:07:06Z")

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Clinician-scientists involved in clinical trials who have inadequate statistical input often design clinical studies to use a binary responder analysis. They seem to believe that because a binary treatment decision is r…

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## [Article(s): Coffee Benefits and Continuous vs. Categorical Variable Analysis](https://discourse.datamethods.org/t/article-s-coffee-benefits-and-continuous-vs-categorical-variable-analysis/5750)

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**Author:** [@Vera\_Wilde](https://discourse.datamethods.org/u/Vera_Wilde)\
**Replies:** 3\
**Last updated:** [June 19, 2022, 8:50pm UTC](https://discourse.datamethods.org/t/article-s-coffee-benefits-and-continuous-vs-categorical-variable-analysis/5750 "2022-06-19T20:50:40Z")

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Saturday morning, feeling guilty about making a second (or was it third?) cup of coffee, I was mucking around on PubMed to see if I could see if we really know if it benefits health. You can’t read the news without heari…

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## [The optimal number of response categories in the Likert scales](https://discourse.datamethods.org/t/the-optimal-number-of-response-categories-in-the-likert-scales/5546)

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**Author:** [@Leni](https://discourse.datamethods.org/u/Leni)\
**Replies:** 4\
**Last updated:** [May 3, 2022, 6:24pm UTC](https://discourse.datamethods.org/t/the-optimal-number-of-response-categories-in-the-likert-scales/5546 "2022-05-03T18:24:42Z")

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Hi, everyone. I want some advice on using the Likert scale. I have some questions that need your help in answering. Is neutral choice (middle point) necessary on the Likert scale? Why? Because I found that some resear…

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## [Interesting Talk on Dichotomization](https://discourse.datamethods.org/t/interesting-talk-on-dichotomization/5329)

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**Author:** [@med\_stat](https://discourse.datamethods.org/u/med_stat)\
**Replies:** 9\
**Last updated:** [March 2, 2022, 12:08pm UTC](https://discourse.datamethods.org/t/interesting-talk-on-dichotomization/5329 "2022-03-02T12:08:55Z")

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Just saw this, and although, I prefer to avoid dichotomization of inputs, I thought the talk was interesting as Dr. Wolf seems to hint at the situation many statisticians are faced with: the clinician wants…

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## [AKI is both more and less than acute kidney injury](https://discourse.datamethods.org/t/aki-is-both-more-and-less-than-acute-kidney-injury/2350)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 18\
**Last updated:** [February 9, 2020, 10:54pm UTC](https://discourse.datamethods.org/t/aki-is-both-more-and-less-than-acute-kidney-injury/2350 "2020-02-09T22:54:57Z")

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Responder analysis is a most problematic statistical analysis. General problems with responder analysis are described here. Analysis of acute kidney injury (AKI) as a binary outcome is one example of responder analysis…