Dear Gerhard,
By clicking on the "Actions" button, I discovered that the contribution comes
from Brian McMahon. Maybe you could contact him about this?
Best regards,
Herman
-----Ursprüngliche Nachricht-----
Von: CCP4 bulletin board <CCP4BB@JISCMAIL.AC.UK> Im Auftrag von Gerard Bricogne
Gesendet: Dienstag, 10. März 2020 15:16
An: CCP4BB@JISCMAIL.AC.UK
Betreff: [EXTERNAL] [ccp4bb] An error in the IUCr Online Dictionary of
Crystallography
EXTERNAL : Real sender is owner-ccp...@jiscmail.ac.uk
Dear all,
While we are all discussing how to "push the frontiers" of our field,
there seem to be some dark and dusty corners in the documentation of some basic
notions. For instance the formula for the real-space correlation coefficient
given at
https://urldefense.proofpoint.com/v2/url?u=https-3A__dictionary.iucr.org_Real-2Dspace-5Fcorrelation-5Fcoefficient&d=DwIBAg&c=Dbf9zoswcQ-CRvvI7VX5j3HvibIuT3ZiarcKl5qtMPo&r=HK-CY_tL8CLLA93vdywyu3qI70R4H8oHzZyRHMQu1AQ&m=1AJ1T0r6mgUdK4idVKIjexWpgp_ApLYGh_-nN1mePPo&s=MizVfSbJiL7RRu5wYQy9khDyX9qrR2dEs_vzAIdQiHk&e=
is completely garbled. The absolute value signs in the denominator are
superfluous, although harmless since we are dealing with real numbers, but the
numerator is wrong in two respects:
1. there should not be absolute values around the deviations from the
mean of the two types of densities;
2. the expression should be a single summation of products of those two
types of deviation, not a product of single sums!
Does anyone know how to get this corrected?
With best wishes,
Gerard.
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