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MPFIT: 95% Confidence Interval ? [message #90206]

Tue, 10 February 2015 16:20

limiqt
Messages: 27
Registered: October 2013

Junior Member

Hi everyone,

I was wondering if someone knows how to plot the 95% CI using the MPFIT curve fitting (http://www.physics.wisc.edu/~craigm/idl/fitting.html).

In the example I can fit my model but now I need to plot the 95% CI as well as the prediction intervals.

;====
Pro fitmydata

X=[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
Y=[5, 10, 6, 20, 30, 20, 60, 90, 70, 100]

expr='P[0]*(X^P[1])'
start = [1D, 0.5]
Yfit = MPFITEXPR(expr, X, Y, 1, start)
fitS=Yfit(0)*(X^Yfit(1))

cgwindow
cgplot, X, Y, psym=16,symsize=1, /noerase, /AddCMD
cgoplot,X, fitS, thick=2, color='red',/AddCMD

End

;====

I will appreciate any assistance,

Thanks,

Lim

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[Message index]

		MPFIT: 95% Confidence Interval ? By: limiqt on Tue, 10 February 2015 16:20
		Re: MPFIT: 95% Confidence Interval ? By: Phillip Bitzer on Wed, 11 February 2015 09:36
		Re: MPFIT: 95% Confidence Interval ? By: Craig Markwardt on Wed, 11 February 2015 13:44

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