title: Outlying values in the National Quality Control Scheme.
abstract: A modified statistical method for the detection of outlying values has been applied to five fortnightly sets of data from the National Quality Control Scheme. The overall outlier rate was 2.4%, not varying greatly between analytes. Many of the outliers appear to be due to sample identification errors.
mesh_terms: D002624:Chemistry, Clinical; D007753:Laboratories / Q000592:standards*; D011786:Quality Control; D013223:Statistics as Topic; D006113:United Kingdom