5

I have daily data. 

6.5315
4.9240
4.3253
3.9703
3.5932
3.2923
3.0785
3.4432
2.6213
2.4083
2.2602
2.1614
2.1351
2.0412

enter image description here

It looks like exponential function or something similar. Is there tool possibly online that may give extrapolated function or functions. e.g. k1*e^(k2*x), k1*e^(k2*x) + C, ax^3+bx^2+c*x+d, etc

and print next values and estimate step number when it will reach 1.0

I need something simple when I get these numbers. Right now I print and continue line by hand.

Max
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    http://www.xuru.org/rt/TOC.asp – Christopher King Jan 03 '14 at 00:30
  • Exactly! Thank You! Put it in answer and I will mark question as answered. – Max Jan 03 '14 at 01:05
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    http://www.wolframalpha.com/input/?i=fit+%7B6.5315%2C4.9240%2C4.3253%2C3.9703%2C3.5932%2C3.2923%2C3.0785%2C3.4432%2C2.6213%2C2.4083%2C2.2602%2C2.1614%2C2.1351%2C2.0412%7D, and, http://www.wolframalpha.com/input/?i=%7B6.5315%2C4.9240%2C4.3253%2C3.9703%2C3.5932%2C3.2923%2C3.0785%2C3.4432%2C2.6213%2C2.4083%2C2.2602%2C2.1614%2C2.1351%2C2.0412%7D – Amzoti Jan 03 '14 at 01:09

1 Answers1

3

You could use regression tools at http://www.xuru.org/rt/TOC.asp. For you example, I got y = $5.549298703 e^{-8.661804988·10^{-2} x}$.

Christopher King
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