| Re: sigma values of polyfit and svdfitr [message #83587] |
Tue, 19 March 2013 06:09 |
Andy Sayer
Messages: 127
Registered: February 2009
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Senior Member |
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Sigma is the uncertainty on the fit parameters (i.e. polynomial/SVD coefficients). From the documentation:
; SIGMA: The 1-sigma error estimates of the returned parameters,
; SIGMA=SQRT(VARIANCE).
Andrew
On Tuesday, March 19, 2013 2:00:31 AM UTC-4, gunvi...@gmail.com wrote:
> Hello sir,
>
> I need to know, what is the sigma value refer to, what is the use of that. Could you please let me know about this.
>
> thanking you
>
> sid
>
>
>
> On Monday, March 18, 2013 7:00:43 PM UTC+5:30, AMS wrote:
>
>> By 'fitting error' do you mean the residuals on the fit? These can be returned using the yfit keyword to these functions.
>
>>
>
>>
>
>>
>
>> Andrew
>
>>
>
>>
>
>>
>
>> On Monday, March 18, 2013 2:26:09 AM UTC-4, gunvi...@gmail.com wrote:
>
>>
>
>>> Hello everyone,
>
>>
>
>>>
>
>>
>
>>> Please let me know how to use the sigma values and returned in polyfit and svdfit to find the fitting error. Its very important for my work.
>
>>
>
>>>
>
>>
>
>>> Please help me out in this respect.
>
>>
>
>>>
>
>>
>
>>> thanking you in advance,
>
>>
>
>>>
>
>>
>
>>> sid
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| Re: sigma values of polyfit and svdfitr [message #83591 is a reply to message #83587] |
Mon, 18 March 2013 23:00  |
gunvicsin11
Messages: 93
Registered: November 2012
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Member |
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Hello sir,
I need to know, what is the sigma value refer to, what is the use of that. Could you please let me know about this.
thanking you
sid
On Monday, March 18, 2013 7:00:43 PM UTC+5:30, AMS wrote:
> By 'fitting error' do you mean the residuals on the fit? These can be returned using the yfit keyword to these functions.
>
>
>
> Andrew
>
>
>
> On Monday, March 18, 2013 2:26:09 AM UTC-4, gunvi...@gmail.com wrote:
>
>> Hello everyone,
>
>>
>
>> Please let me know how to use the sigma values and returned in polyfit and svdfit to find the fitting error. Its very important for my work.
>
>>
>
>> Please help me out in this respect.
>
>>
>
>> thanking you in advance,
>
>>
>
>> sid
|
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| Re: sigma values of polyfit and svdfitr [message #83602 is a reply to message #83591] |
Mon, 18 March 2013 06:30 |
Andy Sayer
Messages: 127
Registered: February 2009
|
Senior Member |
|
|
By 'fitting error' do you mean the residuals on the fit? These can be returned using the yfit keyword to these functions.
Andrew
On Monday, March 18, 2013 2:26:09 AM UTC-4, gunvi...@gmail.com wrote:
> Hello everyone,
>
> Please let me know how to use the sigma values and returned in polyfit and svdfit to find the fitting error. Its very important for my work.
>
> Please help me out in this respect.
>
> thanking you in advance,
>
> sid
|
|
|
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