Stylometry Lab: Who Wrote This?

How to use this lab

Four short cases; pick any one from the tabs. Each takes about 15–20 minutes. You need no account and nothing to install.
Everything runs in your browser. Click the round ▶ next to a code box (or press Shift+Enter inside it), or use Run all.
Every code box is editable: change a number or a word and run it again. + Add a code cell adds your own; Reset code undoes your edits.
The green box at the top of each case says when it is ready. If it is red, it says what to try.
Stuck? Ask B'lawd, the cat in the bottom-right corner. It knows the lecture and every step of this lab.

Privacy: your code and data never leave your browser. The only exception is a question you choose to send to B'lawd, the lab's helper (bottom right): it goes to our server and is answered by Claude (Anthropic).

Download the whole lab (.zip) — for teachers who want to host or archive a copy (needs any static web server; see the README inside).

Waking up Python in your browser…

Loading the Python engine (a few MB, once). Each case then loads its own data, and the packages it needs (NumPy, scikit-learn, matplotlib) the first time a step uses them. Please be patient on slow connections.