/**
* Computes average class values for each attribute and value
*
* @throws Exception
*/
private void computeAverageClassValues() throws Exception {
double totalCounts, sum;
M5Instance instance;
double[] counts;
double[][] avgClassValues = new double[getInputFormat().numAttributes()][0];
m_Indices = new int[getInputFormat().numAttributes()][0];
for (int j = 0; j < getInputFormat().numAttributes(); j++) {
M5Attribute att = getInputFormat().attribute(j);
if (att.isNominal()) {
avgClassValues[j] = new double[att.numValues()];
counts = new double[att.numValues()];
for (int i = 0; i < getInputFormat().numInstances(); i++) {
instance = getInputFormat().instance(i);
if (!instance.classIsMissing() && (!instance.isMissing(j))) {
counts[(int) instance.value(j)] += instance.weight();
avgClassValues[j][(int) instance.value(j)] += instance.weight() * instance.classValue();
}
}
sum = M5StaticUtils.sum(avgClassValues[j]);
totalCounts = M5StaticUtils.sum(counts);
if (M5StaticUtils.gr(totalCounts, 0)) {
for (int k = 0; k < att.numValues(); k++) {
if (M5StaticUtils.gr(counts[k], 0)) {
avgClassValues[j][k] /= (double) counts[k];
} else {
avgClassValues[j][k] = sum / (double) totalCounts;
}
}
}
m_Indices[j] = M5StaticUtils.sort(avgClassValues[j]);
}
}
}
