In eCerto: Statistical Tests for the Production of Reference Materials

Instead of the qualitative significance levels reached in the test, the options panel to the right of Tab.C1 offers the possibility to display the calculated P-values directly for most of the tests. Further, the calculated test statistic values can be displayed. The user can also select to show the critical values at $\alpha=0.05$ and $\alpha=0.01$. Depending on the test these are calculated based on the underlying distributions or obtained from tabulated values.

If any lab is excluded after using the filter section of the analyte panel on top of the page, all tests in Tab.C1 can be conducted without filtered labs selecting the option Exclude filtered Labs. This feature allows to confirm whether or not further outliers are present in the data set. Please use the possibility to remove outliers sequentially with caution, i.e. refrain from over exclusion of initially masked outliers.