GH2z {TukeyGH77}

Inverse of Tukey g-&-h Transformation

Description

To transform Tukey g-&-h quantiles to standard normal quantiles.

Usage

GH2z(q, q0 = (q - A)/B, A = 0, B = 1, ...)

Arguments

q

double vector, quantiles q

q0

(optional) double vector, standardized quantiles q_0=(q-A)/B

A, B

(optional) double scalars, location and scale parameters of Tukey g-&-h transformation. Ignored if q0 is provided.

...

parameters of internal helper function .GH2z

Details

Unfortunately, function GH2z, the inverse of Tukey g-&-h transformation, does not have a closed form and needs to be solved numerically.

For compute intensive jobs, use internal helper function .GH2z.

Value

Function GH2z returns a double vector of the same length as input q.

Examples

z = rnorm(1e3L)
all.equal.numeric(.GH2z(z2GH(z, g = .3, h = .1), g = .3, h = .1), z)
all.equal.numeric(.GH2z(z2GH(z, g = 0, h = .1), g = 0, h = .1), z)
all.equal.numeric(.GH2z(z2GH(z, g = .2, h = 0), g = .2, h = 0), z)