From the Guideline on bioanalytical method validation (2009):
For the validation of the within-run precision, there should be a minimum of five samples per concentration level at LLOQ, low, medium and high QC samples in a single run. The within-run CV value should not exceed 15% for the QC samples, except for the LLOQ which should not exceed 20%.
For the validation of the between-run precision, LLOQ, low, medium and high QC samples from at least three runs analysed on at least two different days should be evaluated. The between-run CV value should not exceed 15% for the QC samples, except for the LLOQ which should not exceed 20%.
Should "between-run precision" and "within-run precision" really take the definite article here? These phrases are parameter names, and the guideline does not refer to a particular "within-run precision" of a particular analytical method.
I sometimes come across parameter names used without the definite article.
Did you know that you could count cricket chirps to estimate temperature?
This signal can be used to estimate temperature and water vapour content throughout the atmosphere.