In eCerto: Statistical Tests for the Production of Reference Materials

Certified value calculation and vizualization of the currently selected analyte

Lab means and their measurement distribution is depicted in a standard graphic layout which can be exported as vector graphic (PDF) for further editing. Labs which have been identified as outliers in Tab.C1 can be excluded from the overall mean calculation in the analyte parameter section at the top of the page. This decision has to be made by the user, eCerto will not remove any outlier automatically. However, eCerto keeps track of the removal and indicates the omitted lab values in the plot as grey data points.

**Fig.C1** Certified Value Plot with filtered Lab and option panel

Besides width and height adjustment, the plot can be modified to include individual measurement using their ID (Show sample IDs). This can be useful to identify potential individual outlier samples. Further, x-axis annotation can be altered to show anonymous Lx values or the imported file names as labels.