R-value: Difference between revisions

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R-value can refer to:

Properties of materials:
- R-value (insulation), the efficiency of insulation of a house
- R-value (soils), stability of soils and aggregates for pavement construction
r-value, in computer science, a value that does not have an address in a computer language
R-factor (crystallography), a measure of the agreement between the crystallographic model and the diffraction data
In statistics, r (or r value) refers to the Pearson product-moment correlation coefficient, often called simply correlation coefficient
In the physical sciences, the gas constant is often denoted by the symbol R
In ophthalmic optics, r-value refers to the distance between the segment optical center and the segment top

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 *[[R-factor (crystallography)]], a measure of the agreement between the crystallographic model and the diffraction data
 *In statistics, ''r'' (or r value) refers to the [[Pearson product-moment correlation coefficient]], often called simply ''correlation coefficient''
+*In the physical sciences, the [[gas constant]] is often denoted by the symbol R
 *In ophthalmic optics, r-value refers to the distance between the segment optical center and the segment top