R-value

From Wikipedia, the free encyclopedia

R-value can refer to:

• Properties of materials:
  • R-value (insulation), the efficiency of insulation
  • 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

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