Statistical Tests for the Production of Reference Materials R package eCerto version 0.8.11 The production of certified reference materials (CRMs) requires various statistical tests depending on the task and recorded data to ensure that reported values of CRMs are appropriate. Often these tests are performed according to the procedures described in 'ISO GUIDE 35:2017'. The 'eCerto' package contains a 'Shiny' app which provides functionality to load, process, report and backup data recorded during CRM production and facilitates following the recommended procedures. It is described in Lisec et al (2023) <doi:10.1007/s00216-023-05099-3> and can also be accessed online <https://apps.bam.de/shn00/eCerto/> without package installation. Software Depends: R (>= 4.1.0) Imports: bslib, config, DT, golem, knitr, markdown (>= 2.0), moments, openxlsx, purrr, R6, rmarkdown (>= 1.5), shiny, shinyjs, shinyWidgets, tidyxl, xml2 Suggests: covr, curl, fs, jsonlite, rlang, testthat (>= 3.0.0), vdiffr, webshot2 Jan Lisec <jan.lisec@bam.de> Comprehensive R Archive Network (CRAN) Jan Lisec [cre, aut] (ORCID: <https://orcid.org/0000-0003-1220-2286>), Frederik Kreß [ctb] MIT + file LICENSE (https://CRAN.R-project.org/package=eCerto/LICENSE) 2026-01-29 application/tgz https://CRAN.R-project.org/package=eCerto doi:10.32614/CRAN.package.eCerto en-US