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Frisch-Waugh-Lovell Theorem: Animated
Update: The code for these animations is available here. Another Update: I think some of the explanations on this page may be helped with more colors. I have some updated visuals here that include...
View ArticleProximate Cause & Theories of Agency
I have deliberately avoided using this blog to engage in overt political discourse, but I’ve never barred myself from political metadiscourse. Political discourse is about our beliefs on governance;...
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Zillow, Prophet, Time Series, & Prices
So I made a mildly controversial tweet. i cannot get over that the zillow data scientist job posting "strongly prefers" you have experience with a python library that is designed to make it as piss...
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Advent of Code 2021 in Google Sheets: First 4 Days
You don’t need to be a “coder” to solve coding problems. If you know Microsoft Excel or Google Sheets, then you can solve these problems, too. There’s tons of overlap between coding and working in...
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Multiple Linear Regression in SQL with Only SUM() and AVG()
This post is inspired by someone dropping this in my mentions today: https://t.co/YULA2kuQCQ— groceries. (@EmericanAconomy) September 15, 2022 The technique the authors use is cute, but it’s not a...
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Caveats and Limitations of A/B Testing at Growth Tech Companies
For non-tech industry folks, an “A/B test” is just a randomized controlled trial where you split users or other things into treatment and control groups, and then later compare key metrics across...
View ArticleGoodbye, Data Science
This is more of a personal post than something intended to be profound. If you are looking for a point, you will not find one here. Frankly I am not even sure who the target audience is for this...
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Intuitive Explanation of Arithmetic, Geometric, & Harmonic Mean
If you Google for an explainer on the differences and use cases for the arithmetic mean vs geometric mean vs harmonic mean, I feel like everything you’ll find is pretty bad and won’t properly explain...
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ChatGPT as a query engine on a giant corpus of text
In the popular imagination, ChatGPT is an intelligent robot that you can talk to. However, it is a better first order approximation to think of ChatGPT as a query engine on a giant corpus of text...
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Should you ask data science job candidates this tricky math question?
The question Quantian1 on Twitter poses the following “junior data scientist” interview question: Junior data scientist interview question: Assume you generate points X = N(0,1); Y = N(0,0.1). Rotate...
View ArticleHow to cut your Python Docker build times in half with uv
When I heard that Charlie Marsh, the creator of Ruff, created a fast replacement for pip called uv, I dropped everything I was doing and added it to all my repos. It’s great. It cut my build times in...
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Why does getting a job in tech suck right now? (Is it AI?!?)
A lot of new CS grads have been noting that is really hard to get a job. I’ve personally been contacted by a couple people, including outside of Twitter, about the difficulty of finding a job. I’m...
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