public static double cov(statistics s1, statistics s2)
{
try
{
if (s1.length() != s2.length())
{
return(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(double.NaN);
}
}
public void initialForm(List <double> listDouble)
{
statistics sta = new statistics(listDouble.ToArray());
lblMean.Text = "均值= " + sta.mean().ToString("0.0");
lblValueMax.Text = "最大值= " + sta.max().ToString("0.0");
lblValueMin.Text = "最小值= " + sta.min().ToString("0.0");
this.lblDataNum.Text = "数据个数= " + sta.length().ToString("0");
this.lblSum.Text = "总和= " + listDouble.Sum().ToString("0.0");
this.lblQ2.Text = "Q2= " + sta.Q2().ToString("0.0");
this.lblVariance.Text = "方差= " + sta.var().ToString("0.0");
}
public double cov(statistics s)
{
try
{
if (this.length() != s.length())
{
return(double.NaN);
}
int len = this.length();
double sum_mul = 0;
for (int i = 0; i <= len - 1; i++)
{
sum_mul += (this.list[i] * s.list[i]);
}
return((sum_mul - len * this.mean() * s.mean()) / (len - 1));
}
catch (Exception)
{
return(double.NaN);
}
}