regression not working

Rune Klarskov Jensen shared this problem 5 years ago
Not a Problem

Input field: h(x)=b*a^x

I created list og points list1 from the spread sheets:

0.00000000000000 6.60000000000001

1.00000000000000 9.10000000000001

2.00000000000000 16.0000000000000

3.00000000000000 22.0000000000000

4.00000000000000 40.0000000000000

5.00000000000000 70.0000000000000

6.00000000000000 100.000000000000

7.00000000000000 137.000000000000


Fit[list1, h(x)]


yields these parameters: 8.2176*1.5018^x


But I should have gotten


6.261*1.5766^x


The last result I got with the command: FitGrowth[list1]


And I allso got the same result using another program, Maple and Nspire.


Hope you have som feedback.


Best regards,

Rune Klarskov Jensen

Comments (2)

photo
1

That is that the last result was confirmed from the other programs :)

photo
1

There are two ways to get the best fit for exponential functions: using FitExp or using Fit. Please see https://www.geogebra.org/he... for details.

© 2021 International GeoGebra Institute