parametersFromPercentiles

Estimates the shape and scale parameters based on supplied values of the percentiles xp1 represents the estimated (from a sample) quantile for p1 represents the estimated (from a sample) quantile for p2 The quantiles must be non-negative and not equal. The probabilities must be within (0,1) and not equal. The returned pair has: component1 = shape component2 = scale See: Marks, Neil B. “Estimation of Weibull Parameters from Common Percentiles.” Journal of Applied Statistics 32, no. 1 (January 2005): 17–24. https://doi.org/10.1080/0266476042000305122.