Re: Relax_fit.py problem

2008-10-15 Thread Tyler Reddy
Hi, I'll try to dig up those references. The other thing I find confusing is that some groups use the curve fit error for the parameters. So, the errors in R1 and R2 per residue are actually from the nonlinear curve fitting process itself. In theory, if there is no error in peak height then the

Re: Relax_fit.py problem

2008-10-15 Thread Tyler Reddy
Hey, Farrow et al. (1994) Biochemistry, 33: 5984-6003 also draw a similar conclusion (paragraph starting at bottom left of p. 5988) and apply the RMS value of the noise as an estimate of the standard deviation of peak intensity. If I'm not mistaken this is the exact assumption made by relax for

Re: Relax_fit.py problem

2008-10-15 Thread Edward d'Auvergne
On Wed, Oct 15, 2008 at 3:53 PM, Tyler Reddy [EMAIL PROTECTED] wrote: Hi, I'll try to dig up those references. The other thing I find confusing is that some groups use the curve fit error for the parameters. So, the errors in R1 and R2 per residue are actually from the nonlinear curve

Re: Relax_fit.py problem

2008-10-15 Thread Edward d'Auvergne
On Wed, Oct 15, 2008 at 4:56 PM, Tyler Reddy [EMAIL PROTECTED] wrote: Hey, Farrow et al. (1994) Biochemistry, 33: 5984-6003 also draw a similar conclusion (paragraph starting at bottom left of p. 5988) and apply the RMS value of the noise as an estimate of the standard deviation of peak

Re: Relax_fit.py problem

2008-10-15 Thread Tyler Reddy
Okay, so I'll basically just need to get the rms noise (NOT S/N) for my T1 and T2 spectra at various fields. I've been using S/N values for the NOE calculations so that explains why those errors seemed so large. I'd like to find a reference for the rms equation which seems to be:

Curve fitting

2008-10-15 Thread Sébastien Morin
Hi, I have a general question about curve fitting within relax. Let's say I proceed to curve fitting for some relaxation rates (exponential decay) and that I have a duplicate delay for error estimation. delays 0.01 0.01 0.02 0.04 ... Will the mean value (for delay 0.01) be

Re: Curve fitting

2008-10-15 Thread Chris MacRaild
On Thu, Oct 16, 2008 at 3:11 PM, Sébastien Morin [EMAIL PROTECTED] wrote: Hi, I have a general question about curve fitting within relax. Let's say I proceed to curve fitting for some relaxation rates (exponential decay) and that I have a duplicate delay for error estimation.