[Gnuplot-info] about error bars when fitting data

[Yong Z. <zh...@bu...>]

Hi,

I met a problem when fitting data.
I have two set of data, both of which are supposed to be a single 
exponential decay function. By setting f(x)=a*exp(-x/T)+b and fitting 
the data via a,T,b, I got some value for these parameters and it seems 
reasonable. The problem is, when looking at the plot, it is quite 
obvious that the second set of data has higher fluctuation than the 
first set, but the error bar provided by gnuplot was quite close for 
both fitted T and b for the two set of data. Could you please provide 
any explanation about this results? The data and fitting results are 
attached.
Thank you.

Best wishes,

-- 
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Yong Zhang
Chemistry Department
Boston University
590 Commonwealth Avenue
Boston,MA,02215
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