Predicting the date a threshhold is reached

marshm

New Member
Joined
Jan 12, 2005
Messages
1
I have seen a coupl posts regarding predictive formulas, usually using TREND or FORECAST. They are based on trying to find a single future value based on historical info. I have a different ciscumstance, and have tried approaches using the above functions, as well as LINEST and others. Here is the issue:

Example data:

1/1 1/8 1/15 1/22 1/29
12.3 12.2 12.0 11.7 11.5

The actual data would likely be over a 6-12 month period based on weekly results.

WHAT I NEED os to figure the likely future date at which the figure is <=11.0. The result could be either a Gregorian date or delta time (preferable).

Any ideas on how to formulate this?

Gene Marsh
 

Excel Facts

Remove leading & trailing spaces
Save as CSV to remove all leading and trailing spaces. It is faster than using TRIM().
Try:

=FORECAST(11,C1:G1,C2:G2)

C1:G1 is the date range
C2:G2 is the data you have

Format the result as a date.
 
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