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  #1  
Old 13-Oct-2003, 05:19
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Math Formula: FORECAST

I am looking for a simple math formula to 'forecast'.

Let's say I have 2 sets of 'related' numbers:
Code:
X       | Y
--------+-------
10      | 1500
21      | 1601
14      | 1333
18      | 1001

Given that I have this 'historical' data, is it possible for someone to show me a really simple formula to predict / forecast the value of Y if X = 16?
  #2  
Old 13-Oct-2003, 17:17
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This is pretty complicated algebra required. Are you testing us or don't you know?

Rob
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Old 14-Oct-2003, 10:24
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Forecast usually means statistically. In which case your sample is probably too small.
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Old 15-Oct-2003, 03:26
Garth Farley Garth Farley is offline
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Well, it's not that complicated. I did interpolation (what this kinda problem is called) last year in Uni, have just kinda forgot the details

How to program it might be tricky though, as it'll be dealing with polynomials of unknown degree with coefficients that'll vary in time. A more accurate/complex algorithm comes to mind, (it works nicely on paper on my lap) but it'd be a struggle to code. There is a simpler one, I'll look it up & post up tomorrow!

GF
  #5  
Old 16-Oct-2003, 08:58
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Thank you for your replies...

Rob, I really don't know...

Div, for the sake of brevity I just put 5 lines in my example. The actual data I have is over 12 - 18 months worth...

Garth, I am looking forward to your suggestion...
 
 
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