文華財經的時間序列類型移動平均線的公式是什麽？

xsum=i+i-1+..+i-n+1

xxsum=i*i+(i-1)*(i-1)+...+(i-n+1)*(i-n+1)

xysum=i*a[i]+(i-1)*a[i]+...+(i-n+1)*a[i-n+1]

k=(xysum -(ysum/n)*xsum)/(xxsum- xsum/n * xsum) //斜率

b= ysum/n - k*xsum/n

forcast[i]=k*i+b //線性回歸

tsma[i] = forcast[i]+k //線性回歸+斜率