public double[] marginalEffectSSdf(int index) {
int error = sweep.A.rows() - 1;
double errorss = sweep.A.getQuick(error, error);
int first = 0;
for (int i = 0; i < index; i++) {
first += xtxmatrices[i][i].rows();
}
int last = first + xtxmatrices[index][index].rows();
int df = 0;
for (int i = first; i < last; i++) {
if (sweep.revg2sweep(i)) {
df++;
}
}
int nonsingular = sweep.sweepSingularColumns();
df -= nonsingular;
double reducedError = sweep.A.getQuick(error, error);
double[] result = new double[] {(reducedError - errorss), df};
for (int i = first; i < last; i++) {
sweep.revg2sweep(i);
}
return result;
}
private void initialSweep() {
sweep.XTX = DoubleFactory2D.dense.compose(xtxmatrices);
sweep.XTy = DoubleFactory2D.dense.compose(xtymatrices);
totalSS = 0;
for (int i = 0; i < data.length; i++) {
totalSS += data[i] * data[i];
}
sweep.yTy = DoubleFactory2D.dense.make(1, 1, totalSS);
sweep.makeA();
int lastrow = sweep.A.rows() - 1;
int col = 0;
double prevSS = totalSS;
for (int i = 0; i < xtxmatrices.length; i++) {
double df = 0;
for (int j = 0; j < xtxmatrices[i][i].rows(); j++) {
if (sweep.revg2sweep(col++)) {
df++;
}
}
effectdf.add(new Double(df));
double newSS = sweep.A.getQuick(lastrow, lastrow);
double difSS = prevSS - newSS;
effectSS.add(new Double(difSS));
prevSS = newSS;
}
}