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Re: Linear fit with user defined weights [message #67327 is a reply to message #67248]

Thu, 16 July 2009 12:04

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Jul 16, 2:03 pm, loknath <ladhik...@gmail.com> wrote:
> Hi,
> Is there a way to calculate the best fit curve for linear fit with
> user defined weights? I looked up linfit, but it does not take weight.
> Ladfit also does not take user defined weights.
>
> thanks

Most of the IDL fitting routines (including LINFIT) use the
MEASURE_ERROR keyword to assign weights. Internally, the program
then assigns a weight, wt for a given measurement error, sdev by the
formula

wt = 1/sdev^2

So you if have weights from some other origin besides measurement
errors, you could set MEASURE_ERROR = 1./sqrt(wt)

--Wayne

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		Re: Linear fit with user defined weights By: Craig Markwardt on Sat, 18 July 2009 02:43
		Re: Linear fit with user defined weights By: wlandsman on Thu, 16 July 2009 12:04

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