Horwitz found that a simple functional relationship described the variation of reproducibility precision in collaborative trials as a fractional power of the concentration of the analyte. This relationship holds reasonably well, irrespective of the analyte, the matrix, or the nature of the test material. A similar relationship has been found in the results of a proficiency test.
M. Thompson and P. J. Lowthian, Analyst, 1995, 120, 271 DOI: 10.1039/AN9952000271
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