https://claydon.co/tags/statistics/ Recent content in Statistics on Thoughts and code Hugo en-us Thu, 02 Apr 2026 08:00:00 +0000 https://claydon.co/code/its-just-vectors/part5-zscores/ Thu, 02 Apr 2026 08:00:00 +0000 https://claydon.co/code/its-just-vectors/part5-zscores/ <p>A fixed similarity threshold is easy to implement and surprisingly hard to justify. It assumes your data behaves consistently, your model behaves consistently, and your definition of “normal” does not drift. None of those assumptions tend to hold for long.</p> <p>Up to this point in the series, we have treated cosine similarity as a raw signal. A number comes out, we compare it to a cutoff, and we move on. Here we start treating those numbers as a distribution instead.</p>