double[] distribution = new double[2];
Instances exi = ex.relationalValue(1);
double[] n = new double[m_Dimension];
double[] xBar = new double[m_Dimension];
for (int i = 0; i < exi.numAttributes() ; i++)
xBar[i] = exi.meanOrMode(i);
for (int w = 0, t = 0; w < m_Dimension; w++, t++){
for (int u = 0; u < exi.numInstances(); u++)
if (!exi.instance(u).isMissing(t))
n[w] += exi.instance(u).weight();