Create field in query to forecast two or three other fields

T

The parawon

Is there a way to have a calculated field create a forecast from two or other
three previous years sales quantity? For example, if I have 2002,2003,2004
(each year in a seperate field) and I want to use a forecast to tell what
2005 and 2006's sales' quantity (each in seperate fields) are likely to be?
Any help in the right direction would be very appreciated.
 
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