In competitive binding assays, the logit-log dose relationship, in which the response is defined by: \(R=\mathrm{logit}\left(y\right)=\log _{10}(\frac{y}{1- y})\) where \(y=\frac{b}{b_{0}}\) with \(b\) = fraction of tracer bound and \(b_{0}\) = value of \(b\) with no unlabelled ligand in the system. Logit transformed assay data frequently yield straight-line dose-response curves, amenable to statistical analysis.