ρσ-equation (rho-sigma equation)

https://doi.org/10.1351/goldbook.E05020
See: σ-constant, Hammett equation, Taft equation, ρ-value
Source:
PAC, 1994, 66, 1077. 'Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)' on page 1162 (https://doi.org/10.1351/pac199466051077)