Hi Troels,
Before this drives you crazy, the reason is dead simple. The Monte Carlo
simulations use a Gaussian distribution. This is correct. But you are
comparing it to a uniform distribution, which is not correct and is much
broader. There's no need to worry.
Regards,
Edward
On Sunday, 31 August 2014, Troels E. Linnet <
NO-REPLY.INVALID-ADDRESS@xxxxxxx> wrote:
URL:
<http://gna.org/bugs/?22554>
Summary: The distribution of intensity with errors in
Monte-Carlo simulations are markedly more narrow than expected.
Project: relax
Submitted by: tlinnet
Submitted on: Sun 31 Aug 2014 07:03:07 PM UTC
Category: relax's source code
Specific analysis category: Relaxation dispersion
Priority: 9 - Immediate
Severity: 4 - Important
Status: None
Assigned to: None
Originator Name:
Originator Email:
Open/Closed: Open
Release: Repository: trunk
Discussion Lock: Any
Operating System: All systems
_______________________________________________________
Details:
It seems that relax draw a lot more narrow distribution of Intensity with
errors, than python module "random".
This has an influence on estimated parameter error.
This is a potential huge error in relax.
A possible example of a catastrophic implementation of Monte-Carlo
simulations.
See:
http://thread.gmane.org/gmane.science.nmr.relax.scm/23239
http://thread.gmane.org/gmane.science.nmr.relax.scm/23238
Attached image that show distribution narrowing for Monte-Carlo
simulations in
relax.
Also attached 2 images, that show there is perfect correlation for
estimation
of errors between boot strapping and from Co-variance matrix.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: Sun 31 Aug 2014 07:03:07 PM UTC Name:
estimate_errors_analyse_relax.py.png Size: 47kB By: tlinnet
<http://gna.org/bugs/download.php?file_id=21975>
-------------------------------------------------------
Date: Sun 31 Aug 2014 07:03:07 PM UTC Name: estimate_errors_data_nt5.png
Size: 73kB By: tlinnet
<http://gna.org/bugs/download.php?file_id=21976>
-------------------------------------------------------
Date: Sun 31 Aug 2014 07:03:07 PM UTC Name: estimate_errors_data_nt10.png
Size: 74kB By: tlinnet
<http://gna.org/bugs/download.php?file_id=21977>
_______________________________________________________
Reply to this item at:
<http://gna.org/bugs/?22554>
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Re: [bug #22554] The distribution of intensity with errors in Monte-Carlo simulations are markedly more narrow than expected.