*1.2. CCPR Comparison Analysis*

Measurement comparisons in the CIPM MRA follow strict rules and are guided by the policies of the Consultative Committee responsible for a particular technical area [5]. Our case study deals with the photometric quantity regular spectral transmittance, which falls under the Consultative Committee for Photometry and Radiometry (CCPR). A detailed description of the analysis recommended for CCPR comparisons was given in [6], where expressions for the uncertainty in DoE values were obtained according to the law of the propagation of uncertainty (LPU) [7]. In practice, these expressions have many terms, which can make data processing quite daunting.
