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[WIP] Implement growth assessment using WHO indicators #80

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lib/growth/calc/centile.ex
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@ -23,11 +23,13 @@ defmodule Growth.Calc.Centile do
alias Growth.Calc.ZScore
@spec compute(number(), number(), number(), number()) :: number()
@spec compute(number(), number(), number(), number()) :: number() | :na
@doc """
Compute the centile for a given measurement (`y`) and the Box-Cox values: power (`l`), median (`m`), and
coefficient of variation (`s`).
Returns the centile based on the z-score when -3 <= z-score <= 3; otherwise, returns `:na.`
## Examples:
iex> Growth.Calc.Centile.compute(19, -1.6318, 16.049, 0.10038)