Mathematical calculation

[j235]

I have a math problem and I want to ask me pomognete.I working on complex desktop database.My main point is making the application for the simulation of tax revenue in Access 2013. Currently I have a mathematical formula written in Access for linear regression coefficent (X and Y) RegressCoeff: (Avg (X * Y) -Avg (X) * Avg (Y)) / VarP (X), but I need a formula to work with three unknowns X, Y and Z.


Please help me glad to expand the formula to work with three X, Y and Z .

[orange]

Is this the same as your previous?
https://www.accessforums.net/queries/multiple-regression-access-2013-a-48414.html

http://www.access-programmers.co.uk/...highlight=math

http://www.access-programmers.co.uk/...d.php?t=271395