linear solvation energy relationships 

https://doi.org/10.1351/goldbook.L03559
Equations involving the application of @S05757@ in linear or multiple (linear) regression expressing the solvent effect on the rate or @E02177@ of a reaction.
Source:
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1136 [Terms] [Paper]