ILS: An R package for statistical analysis in Interlaboratory Studies

One of the novelties of this package is the incorporation of tools to perform an ILS from a functional data analysis approach. Accordingly, the functional nature of the data obtained by experimental techniques corresponding to analytical chemistry, applied physics and engineering applications (spectra, thermograms, and sensor signals, among others) is taking into account by implementing the functional extensions of Mandel's h and k statistics. For this purpose, the ILS package also estimates the functional statistics H(t) and K(t), as well as the dH and dK test statistic, which are used to evaluate the repeatability and reproducibility hypotheses where the critical ch and ck values are estimated by using a bootstrap algorithm.