void Discriminant_getPartialDiscriminationProbability (Discriminant me, long numberOfDimensions, double *p_prob, double *p_chisq, double *p_df)
{
long g = my numberOfGroups;
long p = my eigen -> dimension, k = numberOfDimensions;
long numberOfFunctions = Discriminant_getNumberOfFunctions (me);
double degreesOfFreedom = Discriminant_getDegreesOfFreedom (me);
double prob = NUMundefined, chisq = NUMundefined, df = NUMundefined;
if (k < numberOfFunctions) {
double lambda = NUMwilksLambda (my eigen -> eigenvalues, k + 1, numberOfFunctions);
if (lambda != 1.0) {
chisq = - (degreesOfFreedom + (g - p) / 2.0 - 1.0) * log (lambda);
df = (p - k) * (g - k - 1);
if (p_prob) {
prob = NUMchiSquareQ (chisq, df);
}
}
}
if (p_prob) {
*p_prob = prob;
}
if (p_chisq) {
*p_chisq = chisq;
}
if (p_df) {
*p_df = df;
}
}
double Discriminant_getWilksLambda (Discriminant me, long from) {
long numberOfFunctions = Discriminant_getNumberOfFunctions (me);
if (from >= numberOfFunctions) {
return 1;
}
if (from < 1) {
from = 1;
}
return NUMwilksLambda (my eigen -> eigenvalues, 1 + from, numberOfFunctions);
}
void Discriminant_getPartialDiscriminationProbability (Discriminant me,
long numberOfDimensions, double *probability, double *chisq, long *ndf) {
long g = my numberOfGroups;
long p = my dimension, k = numberOfDimensions;
long numberOfFunctions = Discriminant_getNumberOfFunctions (me);
double degreesOfFreedom = Discriminant_getDegreesOfFreedom (me);
double lambda;
*probability = 1; *chisq = 0; *ndf = 0;
if (k >= numberOfFunctions) {
return;
}
lambda = NUMwilksLambda (my eigenvalues, k + 1, numberOfFunctions);
if (lambda == 1) {
return;
}
*chisq = - (degreesOfFreedom + (g - p) / 2 - 1) * log (lambda);
*ndf = (p - k) * (g - k - 1);
*probability = NUMchiSquareQ (*chisq, *ndf);
}
