Calculate standard normal table #108
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It's the max the original table has. :) We can change to 3 and update the tests.
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yeah, the question is then why does the original table stop then...
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Probably because it's so close to 1 for values after 3 that the error becomes acceptable. See the graph here https://en.wikipedia.org/wiki/File:Normal_Distribution_CDF.svg, red line.
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👍 awesome |
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Closes #107. The tables are identical. The calculation itself is sub-1ms.
We could improve the current precision further by either bumping the table size, the number of digits and iterations.
Or, we could expose the actual function with memoization. A non-rounding calculating function call takes about 3-4 times more than the table call currently with 20 iterations.