dot-gpdFittedPValue: Compute p-value based on generalized Pareto distribution...

In goncalves-lab/diffexpR: Statistical tests for detecting differential distributions based on the 2-Wasserstein distance

Compute p-value based on generalized Pareto distribution fitting

Description

Computes a p-value based on a generalized Pareto distribution (GPD) fitting. This procedure may be used in the semi-parametric 2-Wasserstein distance-based test to estimate small p-values accurately, instead of obtaining the p-value from a permutation test.

Usage

.gpdFittedPValue(val, distr.ordered)

Arguments

val	value of a specific test statistic, based on original group labels
distr.ordered	vector of values, in decreasing order, of the test statistic obtained by repeatedly permuting the original group labels

Value

A vector of three, see Schefzik et al. (2020) for details:

• pvalue.gpd: p-value obtained when using the GPD fitting test

• ad.pval: p-value of the Anderson-Darling test to check whether the GPD actually fits the data well

• N.exc: number of exceedances (starting with 250 and iteratively decreased by 10 if necessary) that are required to obtain a good GPD fit, i.e. p-value of Anderson-Darling test \geq 0.05

References

Schefzik, R., Flesch, J., and Goncalves, A. (2020). waddR: Using the 2-Wasserstein distance to identify differences between distributions in two-sample testing, with application to single-cell RNA-sequencing data.

goncalves-lab/diffexpR documentation built on June 5, 2023, 10:18 p.m.