Computes the sample probability value (p-value)
for the estimated coefficient from a standard
genome-wide univariate regression. It computes the exact
finite-sample p-value under the assumption that the measured
phenotype (the dependent variable in the regression) has
a known Bernoulli-normal mixture distribution.
Finite-sample genome-wide regression p-values (Gwrpv) with
a non-normally distributed phenotype (Gregory Connor and
Michael O'Neill, bioRxiv 204727