Fit function and uncertainty

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Christos Papadopoulos
Christos Papadopoulos on 11 Oct 2019
Hi everybody,
i used the 'fit' functin to fit data to a gauss function
'a + b1 * exp(-(x-x1)^2/(2*sigma1^2)) + b2 * exp(-((x-x2)^2)/(2*(sigma2^2))'
and got a centroid at x1 and x2.
The ouput is:
a = 0.9905 (0.8866, 1.094)
b1 = 3.294 (2.896, 3.693)
b2 = 4.09e+04 (-1.652e+11, 1.652e+11)
sigma1 = 39.21 (33.55, 44.87)
sigma2 = 184.2 (-1.948e+07, 1.948e+07)
x1 = 597.5 (592.1, 602.9)
x2 = -1090 (-2.408e+08, 2.408e+08)
(forget about x2)
and:
sse: 1.8839e+03
rsquare: 0.2572
dfe: 1021
adjrsquare: 0.2528
rmse: 1.3584
Does any of these figures give me the uncertainty of the centroid?
Thanks for your help.
Best Chris

Answers (2)

Alex Sha
Alex Sha on 12 Oct 2019
Hi, attach your data file please, if possible.

Christos Papadopoulos
Christos Papadopoulos on 16 Oct 2019
Hi
i'm sorry i can't. :/
but do you know what all these figures tell me?
Best
Chris

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