R-value

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
• Lankford coefficient

See also

• R rating (disambiguation)
• L-value (disambiguation)