Please tell us in plain English exactly what you want to accomplish.
Then put some context on your set up:
-Web or desktop database?
-subject of the database?
-what you have tried with what results (errors, messages???)
This may be what you're looking for, or at least a start.
Good luck - more info may get you more focused responses.
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 SQL code to calculate simple linear regression but I need code for multiplle regression.