public double degreesOfFreedom() {
double ni = Double.valueOf(nItems).doubleValue();
double m = (ni * (ni + 1.0)) / 2.0;
double df = m - model.getNumberOfParameters();
return df;
}
public double bic() {
double b = chisquare() + model.getNumberOfParameters() * Math.log(numberOfExaminees) * nItems;
return b;
}
