Approximation of the of the value of the distribution function of a Gaussian quadratic form based on its first three moments.
pearson.qf(x, moment, lower.tail = TRUE, verbose = FALSE)value at which the distribution function is to be evaluated
vector with the mean, variance and skewness of the quadratic form
logical, indicating of the lower or upper tail of the distribution function should be calculated
logical, if TRUE a warning is issued if negative moments are sanitized to 0.
This is Pearson's approximation for Gaussian quadratic forms as stated in [4] (equation (4.65) in arXiv:1808.07280v2)
For the theoretic background see the reference [4] given on the main help page of this package: multivariance-package.