spt
fun sptCoefficients(lowerQuantile: Double, median: Double, upperQuantile: Double, alpha: Double = DEFAULT_ALPHA, lowerBound: Double = Double.NEGATIVE_INFINITY, upperBound: Double = Double.POSITIVE_INFINITY): DoubleArray(source)
The three coefficients implied by a symmetric percentile triplet.
Keelin's Propositions 3 and 4 are Proposition 1 applied to the transformed quantiles, so the quantiles are mapped into fitting space first and one expression then serves every member of the family.