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 < [email protected]> 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> > > _______________________________________________ > Message sent via/by Gna! > http://gna.org/ > > > _______________________________________________ > relax (http://www.nmr-relax.com) > > This is the relax-devel mailing list > [email protected] <javascript:;> > > To unsubscribe from this list, get a password > reminder, or change your subscription options, > visit the list information page at > https://mail.gna.org/listinfo/relax-devel > _______________________________________________ relax (http://www.nmr-relax.com) This is the relax-devel mailing list [email protected] To unsubscribe from this list, get a password reminder, or change your subscription options, visit the list information page at https://mail.gna.org/listinfo/relax-devel
