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EnglishWho is Chris Said?
Updated
Chris Said is a data scientist at Propel and the author of the blog at chris-said.io. According to the site's own description, the blog is "mostly about statistics, technology, and science." The homepage also notes that he can be found on Twitter and LinkedIn, though the page evidence does not include links or handles for either account.
What you'll find on the site
The homepage is organized as a personal blog index rather than a portfolio or resume. It presents a short self-description followed by two lists of writing:
- Selected Blog Posts — a curated handful of posts the author highlights, including a three-part series on optimizing sample sizes in A/B testing (Part I dated 10 Jan 2020), "Variance after scaling and summing" (18 May 2019), "Empirical Bayes for multiple sample sizes" (03 May 2017), "Optimizing things in the USSR" (11 May 2016), and "Small correlations can drive large increases in teen depression" (10 May 2022).
- Full Blog Archive — a longer chronological list of posts, with dates ranging from 2020 through 2026 in the page evidence.
Topics covered
Based on the post titles in the archive, the writing spans several recurring areas:
| Area | Example posts |
|---|---|
| Statistics and methods | "You're probably measuring your treatment effect incorrectly" (28 Mar 2021); "Instrumental variables analysis for non-economists" (13 Mar 2021); "Things that confused me about cross-entropy" (26 Dec 2020) |
| A/B testing and experimentation | "Optimizing sample sizes in A/B testing" series (Jan 2020) |
| Science policy and misconduct | "The case for criminalizing scientific misconduct" (17 Jun 2024); "Scientific whistleblowers can be compensated for their service" (18 Aug 2024) |
| Public health and COVID-19 | "Why low sensitivity antigen tests are better than slow PCR tests" (15 Jul 2020); "Waning immunity and the little paradox of R0" (01 Jan 2022) |
| Technology and technical notes | "Upgrading to MathJax 3.0 after the Kramdown update in Github Pages" (05 Sep 2020) |
| Miscellaneous essays | "The shower problem" (08 Feb 2020); "The Air Quality Index doesn't make any sense" (19 Jun 2023) |
How to use the site
If you're looking for a specific post, the Full Blog Archive is the most direct route — it lists titles with publication dates. If you want a sense of the author's strongest or most representative work, start with the Selected Blog Posts section, which links the A/B testing series and a few statistics-focused essays. The page evidence shows titles and dates but not full post URLs, so navigation within the site would be needed to reach individual articles.
What the page does not tell you
The homepage excerpt does not include a biography beyond the Propel role, contact details, an RSS feed, or any statement about subscriptions or pricing. It also does not list the Twitter or LinkedIn handles, only that those accounts exist. For anything beyond the post index and the one-line self-description, you'd need to follow the links on the site itself.