R-value

R-value or rvalue may refer to:

In computer science, a value considered independently of its storage location
R-value (insulation) in building engineering, the efficiency of insulation of a house
R-value (soils) in geotechnical engineering , the stability of soils and aggregates for pavement construction
R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data
In statistics, the Pearson product-moment correlation coefficient, or simply correlation coefficient
In ophthalmic optics, the distance between the segment optical center and the segment top
In solid mechanics, the Lankford coefficient

See also