How to Multiple Regression Forecast Using HP 17BII?

[Namir]

The HP-17BII manual mentions ONLY linear regression. You need other machines or software like Excel to do multiple linear(ized) regression.

There is a trick to transform multiple regression to linear regression:

y = a + b*x + c*z

y - a = b*x + c*z

(y - a) / z = c + b *(x/z)

You assume a, calculate values for Y=(y-a)/z and X=(x/z), and then do a linear regression between Y and X. You repeat this process by varying the value of "a" until you maximize R-square.

Namir