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Author Excel Formula
RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
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6th Jul 12 at 09:22   View User's Profile U2U Member Reply With Quote
Having a blonde moment - what does the e mean?



I thought it was 10^ but the formula doesn't work out?

x = 150 then y = 825
Ian
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Registered: 28th Aug 99
Location: Liverpool
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6th Jul 12 at 13:39   View Garage View User's Profile U2U Member Reply With Quote
http://en.wikipedia.org/wiki/E_%28mathematical_constant%29

Think its used there so the exponent it works out for you is the actual true gradient of that approximation, as opposed to just giving you a regular a^b which wouldn't scale.

The formula will never work out as that line is an approximation - the polynomial curve which best fits your data. Even thought your data does not have a true exponential relationship.

 
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