"The Government are very keen on amassing statistics - they collect them, add them, raise them to the n-th power, take the cube root and prepare wonderful diagrams. But what you must never forget is that every one of those figures comes in the first instance from the village watchman, who just puts down what he damn pleases."
- Josiah Stamp, 1929.
Knowing where your data come from is tremendously important.
Turning a probability vector into a state
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