Tool to extrapolate data

Question

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

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.

Answer 1

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