import java.util.*;
import java.lang.*;
/*
Stats Class v. 0.01.  Written by G. Rob Burgess 1997
    Fell free to adapt for your own use.
*/
public class Stats {
    public double sum, avg, vari;
    public int n;
    public static final int MAX_X = 40;

    public Stats(String name) {
		  double x[] = new double[MAX_X];
		  n = 0;
		  sum = 0;
		  if (name == null) return;
		  StringTokenizer st = new StringTokenizer(name, ",");
		  try {
		    for(int i = 0; st.hasMoreTokens(); i++) {
		        Double f = new Double(st.nextToken());
		        x[i] = f.doubleValue();
		        sum = sum + x[i];
		        n++;
		    }
		  }
		  catch (NumberFormatException e) {return; }

          avg = sum /n;
          vari = 0;
          for (int i = 0;i < n; i++) {
            vari = vari + (avg - x[i])*(avg - x[i]);
          }
          vari = vari / (n-1);
    }
}