[SOLVED] Multiple regression equation trouble

Hello,

Ive generated a multiple regression equation using a tool i got online. It takes a list of dependent variables and a few independant variables and gives me a multiple regression equation. The equation is trying to predict defects in a software program. The dependant variables is defect count

the equation i got is

0.32*Avg analysis hr +-0.12*Avg. Dev hrs + 0.00*Budget +-0.19*Duration + 19.40 (+/- 21.56)

These independant variables are project details.

What im trying to do is put one of the projects details back into the equation and get a value for defects.

My problem is that when i put these values in (to test the equation) i get a value which is no where near the actual defects that that project had. even though this project was used in the actual making of the equation.

Any ideas??

The R squared of this equation is 91%

Standard error is 21.56