Nina B. Zumel

I've added a comment system!

This was originally posted to RWorks.

Continuing my theme from last time of mental calculation and divisibility tricks that I didn’t learn in school, here’s a cool one: A number N is divisible by 11 if the alternating sum of its digits is divisible by 11.

I’ve been working on another puzzle post, which will eventually show up here (but probably first on Rworks).

After having worked on The Twelve Coins Puzzle by hand, I got curious about implementing Dyson’s “elegant” oblivious solution, which I mentioned in that previous post.

Photo by Marco Verch, CC-2.0.

I was thinking about the Four Weights problem again recently.

This puzzle is again from Dudeney's "The Worlds Best Puzzles", in the December 1908 Strand Magazine.

Here are a couple of puzzles from Henry Dudeney's article "The Best Puzzles with Coins," in the Strand Magazine, July 1909.

This is from Henry Dudeney’s “Perplexities” article in the March 1925 issue of The Strand Magazine: A man went into a bank with 1,000 silver dollars and 10 bags.

Here’s another puzzle from Henry Dudeney’s article “The World’s Best Puzzles”, The Strand Magazine, December 1908.

I was browsing the December, 1908 issue of The Strand Magazine (it’s related to a hobby of mine), when I came across an article called “The World’s Best Puzzles”, by Henry Dudeney, who seems to have been the Martin Gardner of his day.

Note: This post is best seen on my site, on a desktop/laptop.

For no particular reason, I started wondering if I could add sidenotes to my blog.

This is a followup to the Win Vector blog article Post-hoc Adjustment for Zero-Thresholded Linear Models, in which I showed how to use a one-variable GAM (e.g., a spline) to adjust a linear model in a problem space where outcomes are strictly nonnegative.

Simpson’s paradox is when a trend that is present in various groups of data seems to disappear or even reverse when those groups are combined.

...or, what nowadays one might call "non-AI generative art."

I recently posted elsewhere about something silly ChatGPT did when we asked it about states' names.

After migrating this blog to Eleventy, I made the comment on Micro.blog that Eleventy "is so much easier to wrap my arms around" than Jekyll was.

My jekyll-generated website (served by Github Pages) failed to build a couple of weeks ago; I don't know why.

So, my husband typed this into ChatGPT 3.5: What are some English words that are 4 letters long, start with f, and end with k?

I have a new blog post up on the Win Vector blog: Detecting Data Differences Using the Sphering Transform.

Just created a handy little Rosetta stone of common data operations using both the pandas and polars libraries.

This article is a shortened version of a post from the Wallaroo Blog, originally written by Julio Barros and me.

I have a new article up on the Win-Vector blog, about the ξ ('XI') correlation coeffient that was recently introduced by Professor Sourav Chatterjee in his paper, “A New Coefficient of Correlation”.

I ran across this essay recently on the role of design standards for scientific data visualization.

So there's this article that's been making the rounds called "The 10 Least Stressful Jobs of 2013"; perhaps you've read it.

One of my favorite cheesy movies is a gem from 1984 called The Adventures of Buckaroo Banzai Across the 8th Dimension.

I came across an interesting article in The Atlantic a little while back that discussed the connection between writing and thinking.

When people ask me what it means to be a data scientist, I used to answer, "it means you don't have to hold my hand."

I came across a post from Emily Willingham the other day: "Is a PhD required for Good Science Writing?".