Does the position of this "inflection point" depend on the redundancy? Maybe it does not; for high-redundancy data one would simply get a much higher corresponding Rsym.
On 3/3/11 11:13 AM, "Ed Pozharski" <epozh...@umaryland.edu> wrote: On Thu, 2011-03-03 at 16:02 +0100, Vellieux Frederic wrote: > For myself, I decide on the high resolution cutoff by looking at the > Rsym vs resolution curve. The curve rises, and for all data sets I > have > processed (so far) there is a break in the curve and the curve shoots > up. To near vertical. This "inflexion point" is where I decide to > place > the high resolution cutoff, I never look at the I/sigma(I) values nor > at > the Rsym in the high resolution shell. > Fred, while your procedure is definitely more sophisticated than what I do, let me point out that the Rsym is genuinely a bad measure for this, as it depends strongly on redundancy. Does more robust measures (e.g. Rpim) show similar "inflexion"? I suspect it will at least shift towards higher resolution. Cheers, Ed. -- "I'd jump in myself, if I weren't so good at whistling." Julian, King of Lemurs