/** It computes the average and standard deviation of the input attributes */
private void computeStatistics() {
stdev = new double[this.getnVars()];
average = new double[this.getnVars()];
for (int i = 0; i < this.getnInputs(); i++) {
average[i] = 0;
for (int j = 0; j < X[i].length; j++) {
average[i] += X[i][j];
}
average[i] /= X[i].length;
}
average[average.length - 1] = 0;
for (int j = 0; j < outputReal.length; j++) {
average[average.length - 1] += outputReal[j];
}
average[average.length - 1] /= outputReal.length;
for (int i = 0; i < this.getnInputs(); i++) {
double sum = 0;
for (int j = 0; j < X[i].length; j++) {
sum += (X[i][j] - average[i]) * (X[i][j] - average[i]);
}
sum /= X[i].length;
stdev[i] = Math.sqrt(sum);
}
double sum = 0;
for (int j = 0; j < outputReal.length; j++) {
sum +=
(outputReal[j] - average[average.length - 1])
* (outputReal[j] - average[average.length - 1]);
}
sum /= outputReal.length;
stdev[stdev.length - 1] = Math.sqrt(sum);
}
/** It computes the average and standard deviation of the input attributes */
private void computeStatistics() {
stdev = new double[this.getNvariables()];
average = new double[this.getNvariables()];
for (int i = 0; i < this.getnInputs(); i++) {
average[i] = 0;
for (int j = 0; j < this.getNdatos(); j++) {
if (!this.isMissing(j, i)) {
average[i] += X[j][i];
}
}
average[i] /= this.getNdatos();
}
average[average.length - 1] = 0;
for (int j = 0; j < outputReal.length; j++) {
average[average.length - 1] += outputReal[j];
}
average[average.length - 1] /= outputReal.length;
for (int i = 0; i < this.getnInputs(); i++) {
double sum = 0;
for (int j = 0; j < this.getNdatos(); j++) {
if (!this.isMissing(j, i)) {
sum += (X[j][i] - average[i]) * (X[j][i] - average[i]);
}
}
sum /= this.getNdatos();
stdev[i] = Math.sqrt(sum);
}
double sum = 0;
for (int j = 0; j < outputReal.length; j++) {
sum +=
(outputReal[j] - average[average.length - 1])
* (outputReal[j] - average[average.length - 1]);
}
sum /= outputReal.length;
stdev[stdev.length - 1] = Math.sqrt(sum);
}