# data reduction

**URL:** https://discourse.datamethods.org/c/stat/reduce/20.md

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## [About the data reduction category](https://discourse.datamethods.org/t/about-the-data-reduction-category/43)

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

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data reduction (principal components, etc.), clustering, unsupervised learning

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## [RMS Case Study in Data Reduction](https://discourse.datamethods.org/t/rms-case-study-in-data-reduction/11210)

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**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 8\
**Last updated:** [October 16, 2026, 7:07pm UTC](https://discourse.datamethods.org/t/rms-case-study-in-data-reduction/11210 "2026-10-16T19:07:12Z")

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Regression Modeling Strategies: Case Study in Data Reduction This is the eighth of several several connected topics organized around chapters in Regression Modeling Strategies. The purposes of these topics are to introd…

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## [Inherent problems of cluster analysis](https://discourse.datamethods.org/t/inherent-problems-of-cluster-analysis/4402)

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**Author:** [@good.tony](https://discourse.datamethods.org/u/good.tony)\
**Replies:** 17\
**Last updated:** [May 27, 2021, 11:09am UTC](https://discourse.datamethods.org/t/inherent-problems-of-cluster-analysis/4402 "2021-05-27T11:09:42Z")

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Unfortunately I have no formal statistical training and my background consists of a few online courses on R and constant googling for answers on stack. So I have a bit of a mess of statistical concepts in my head that I …

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## [Canonical Correlation Analysis Question](https://discourse.datamethods.org/t/canonical-correlation-analysis-question/3618)

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**Author:** [@venkmurthy](https://discourse.datamethods.org/u/venkmurthy)\
**Replies:** 3\
**Last updated:** [August 28, 2020, 8:56pm UTC](https://discourse.datamethods.org/t/canonical-correlation-analysis-question/3618 "2020-08-28T20:56:35Z")

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Hi Everyone! I have been interested in using sparse canonical correlation analysis as implement in the R PMA package. I’m finding that the correlations output by the package seem slightly inconsistent with the ones you …