public static double cov(statistics s1, statistics s2)
{
try
{
if (s1.length() != s2.length())
{
return(0.0); //double.Nan;;
}
int len = s1.length();
double sum_mul = 0;
for (int i = 0; i <= len - 1; i++)
{
sum_mul += (s1.list[i] * s2.list[i]);
}
return((sum_mul - len * s1.mean() * s2.mean()) / (len - 1));
}
catch (Exception)
{
return(0.0); //double.Nan;;
}
}
public static double b(statistics design1, statistics design2)
{
return(design1.mean() - a(design1, design2) * design2.mean());
}
public double b(statistics design)
{
return(this.mean() - this.a(design) * design.mean());
}