# formal

**URL:** https://discourse.datamethods.org/c/stat/formal/7.md

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## [About the formal category](https://discourse.datamethods.org/t/about-the-formal-category/20)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 0

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statistical tests and inference

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## [Hmisc::summaryM()](https://discourse.datamethods.org/t/hmisc-summarym/22166)

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**Author:** [@stsang](https://discourse.datamethods.org/u/stsang)\
**Replies:** 4\
**Last updated:** [November 5, 2024, 7:41pm UTC](https://discourse.datamethods.org/t/hmisc-summarym/22166 "2024-11-05T19:41:07Z")

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I used the function to test a variable (with two categories). The statistics column states that it is F1 with df (1,number of observations-2). I initially thought that it was a mistake. Then the footnote say that the…

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## [Why so big difference in the p values obtained from logistic regression and Fisher's exact test?](https://discourse.datamethods.org/t/why-so-big-difference-in-the-p-values-obtained-from-logistic-regression-and-fishers-exact-test/6284)

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**Author:** [@Lin\_Caijin](https://discourse.datamethods.org/u/Lin_Caijin)\
**Replies:** 2\
**Last updated:** [December 12, 2022, 1:21pm UTC](https://discourse.datamethods.org/t/why-so-big-difference-in-the-p-values-obtained-from-logistic-regression-and-fishers-exact-test/6284 "2022-12-12T13:21:58Z")

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Here is a data frame. \> tmp\_df BRCA1\_MYC2 Best\_response3 1 BRCA1 0 2 BRCA1 0 3 BRCA1 0 4 BRCA1 0 5 MYC 1 6 BRCA1 …

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## [What is type I error?](https://discourse.datamethods.org/t/what-is-type-i-error/877)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 55\
**Last updated:** [February 11, 2021, 9:57pm UTC](https://discourse.datamethods.org/t/what-is-type-i-error/877 "2021-02-11T21:57:18Z")

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Statisticians, clinical trialists, and drug regulators frequently claim that they want to control the probability of a type I error, and they go on to say that this equates to a probability of a false positive result. T…

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## [Journal Article: Which is more generalizable, powerful and interpretable in meta-analyses, mean difference or standardized mean difference?](https://discourse.datamethods.org/t/journal-article-which-is-more-generalizable-powerful-and-interpretable-in-meta-analyses-mean-difference-or-standardized-mean-difference/3978)

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**Author:** [@R\_cubed](https://discourse.datamethods.org/u/R_cubed)\
**Replies:** 4\
**Last updated:** [December 12, 2020, 4:17pm UTC](https://discourse.datamethods.org/t/journal-article-which-is-more-generalizable-powerful-and-interpretable-in-meta-analyses-mean-difference-or-standardized-mean-difference/3978 "2020-12-12T16:17:33Z")

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I thought this would be rather interesting, considering some of the things I’ve learned over the past year or so doing research on meta-analysis. It took awhile, but much of what I believed (ie. meta-analysis is a relat…

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## ["Observed Power" and other "Power" Issues](https://discourse.datamethods.org/t/observed-power-and-other-power-issues/731)

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**Author:** [@ADAlthousePhD](https://discourse.datamethods.org/u/ADAlthousePhD)\
**Replies:** 74\
**Last updated:** [September 6, 2020, 9:26pm UTC](https://discourse.datamethods.org/t/observed-power-and-other-power-issues/731 "2020-09-06T21:26:20Z")

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@zad, I saw this comment of yours on Andrew Gelman’s website and wondered if you would be willing to discuss here: “I submitted something similar to JAMA last month regarding a trial that investigated the effects of an …

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## [Absolute risk measures from count models](https://discourse.datamethods.org/t/absolute-risk-measures-from-count-models/826)

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**Author:** [@sconti555](https://discourse.datamethods.org/u/sconti555)\
**Replies:** 6\
**Last updated:** [October 24, 2018, 9:33am UTC](https://discourse.datamethods.org/t/absolute-risk-measures-from-count-models/826 "2018-10-24T09:33:31Z")

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Dear all: I’m new to this list – whose ideators and moderators I wish to sincerely thank for setting up and running – so apologies in advance if cross-posting. I’m member of a team of statisticians and data managers ca…