# \#pcs

**URL:** https://discourse.datamethods.org/tag/pcs/157.md

[Latest](https://discourse.datamethods.org/latest.md) · [Categories](https://discourse.datamethods.org/categories.md) · [Tags](https://discourse.datamethods.org/tags.md)

---

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

<div class="topic-metadata">

**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")

</div>

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…

---

## [Penalized Likelihood vs. Variance Decomposition Approaches](https://discourse.datamethods.org/t/penalized-likelihood-vs-variance-decomposition-approaches/6790)

<div class="topic-metadata">

**Author:** [@f2harrell](https://discourse.datamethods.org/u/f2harrell)\
**Replies:** 2\
**Last updated:** [April 17, 2024, 1:56pm UTC](https://discourse.datamethods.org/t/penalized-likelihood-vs-variance-decomposition-approaches/6790 "2024-04-17T13:56:06Z")

</div>

Lohmann, Groenwold, and van Smeden have just published the kind of paper I have been waiting for a long time: Comparison of likelihood penalization and variance decomposition approaches for clinical prediction models: A …

---

## [Principal Components analysis - any useful hints and references](https://discourse.datamethods.org/t/principal-components-analysis-any-useful-hints-and-references/4169)

<div class="topic-metadata">

**Author:** [@SueMallett](https://discourse.datamethods.org/u/SueMallett)\
**Replies:** 1\
**Last updated:** [March 5, 2021, 6:54pm UTC](https://discourse.datamethods.org/t/principal-components-analysis-any-useful-hints-and-references/4169 "2021-03-05T18:54:08Z")

</div>

With radiologist colleagues, I have been writing a short article on a fews do’s and don’ts in prediction modelling for radiologists. Can anyone recommend articles with good guidance on when and how to use Principal Comp…