【求助】相对标准偏差

给你一个CE2002-657的原文，上面有具体的关于重复性的计算公式，只不过这个只是计算出来了R，你要自己根据经典算法反推iR是多少。
The inter-laboratory coefficient of variation (CV) for the repeated analysis of a reference or fortified material,
under reproducibility conditions, shall not exceed the level calculated by the Horwitz Equation. The equation is:
CV = 2(1 – 0,5 log C)
where C is the mass fraction expressed as a power (exponent) of 10 (e.g. 1 mg/g = 10-3). Examples are shown in
the table 3.
Table 3
Examples for reproducibility CVs for quantitative methods at a range of analyte mass fractions
1 μg/kg (*)
10 μg/kg (*)
100 μg/kg 23
1 000 μg/kg (1 mg/kg) 16
(*) For mass fractions lower than 100 μg/kg the application of the Horwitz Equation gives unacceptable high values. Therefore,
the CVs for concentrations lower than 100 μg/kg shall be as low as possible.
For