https://doi.org/10.1351/goldbook.08078
Standard deviation of a mass fraction of a component under reproducibility conditions of measurement divided by the corresponding standard deviation calculated from the Horwitz equation.
Notes:
- The Horwitz ratio is used as a test of the fitness for purpose of methods of chemical analysis.
- The experimental measurement precision is better than to be expected from the Horwitz equation if the Horwitz ratio is less than 1 and poorer if greater than 1. In practice, ratios between 0.5 and 2.0 are acceptable.
- In, the "Horwitz ratio" is defined as the ratio of the standard deviation under reproducibility conditions of measurement and standard deviation under repeatability conditions of measurement. This use is discouraged because of the possibility of confusion with the older usage.
Figure 1: Horwitz curve (trumpet, horn). Expected relative standard deviation under reproducibility conditions of measurement,