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Fizz buzz through Monoids

I once saw a very neat fizz buzz. It's still the best I've seen. Come look at it!

Full article (1–4 minute read): Fizz buzz through Monoids

Flashcard of the week

What is the two-step-ahead forecast of an MA(1) process?

Here it is useful to know that MA(1) means moving average with a window size looking one unit of time back. The two-step-ahead forecast, as well as the three-step ahead forecast, and the four-step ahead forecast, etc. are equal to

The long-term mean.

Moving averages (in contrast to e.g. exponential averages, which are really autoregressive processes) really have a memory as short as their averaging window.

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