On Wed, Oct 15, 2008 at 7:30 PM, Tyler Reddy <[EMAIL PROTECTED]> wrote: > 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:
Those would be quite big errors :) > [sqrt(2)]*(baseline noise height)/4 I think: sigma_h = rmsd(noise), is sufficient, where sigma_h is the peak height uncertainty and rmsd(noise) is the RMSD of the base plane noise. Tom Goddard added the RMSD calculation to Sparky (http://www.cgl.ucsf.edu/home/sparky/) - but I've still to thank him for adding that so quickly after I asked by giving him a citation. I don't know if other programs can calculate this RMSD value. > Ignoring the stuff with duplicate spectra, it's actually a rather nice > situation > with only peak height and baseline noise height being the information > required > for the calculation of NOE, R1, R2, and the propagation of their respective > errors. Presumably this would then be enough to begin the model-free > analysis > in relax? This would save NMR time and it would be sufficient for a model-free analysis if done carefully. Remember that the RMSD value in the random coil region is higher than the empty parts of the spectrum, so don't forget to get some estimates by measuring in there. Regards, Edward _______________________________________________ relax (http://nmr-relax.com) This is the relax-users 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-users
