Hi, in the Rupp book the following relation is reported (on pag 415): Rmerge ≈ 0.8/<I/σ(I)> referring to a relation of "the linear merging R-value with the signal-to-noise ratio".
in a 2006 CCP4bb, Manfred Weiss reported: Rrim (or Rmeas) = 0.8*sd(i)/I so, First question: is it Rmerge or Rmeas (Rrim) that we are dealing with? Second question: at the denominator (of the Rupp way to write), it is the aimless Mn(I/sd) (usually indicated as the real signal-to-noise ratio) or the aimless I/sigma (very different from Mn(I/sd) with high redundancy)? Thank you very much for the clarification. Best, Roberto. Roberto Battistutta Associate Professor Department of Chemistry University of Padua via Marzolo 1, 35131 Padova - ITALY tel. +39.049.827.5262 fax. +39.049.827.5829 roberto.battistu...@unipd.it www.chimica.unipd.it/roberto.battistutta/ VIMM (Venetian Institute of Molecular Medicine) via Orus 2, 35129 Padova - ITALY tel. +39.049.7923.236 fax +39.049.7923.250 www.vimm.it
