Validation of a ferritin assay
For each of seven periods in which there was a new batch of reagent, a small set of patient samples was assayed for ferritin content using both the old and new batches.
A data frame with 162 observations on the following 4 variables.
the transition number, 1 to 7
assay result using the old lot of the reagent
assay result using the new lot
The samples from each period are distinct.
In the second data set
ferritin2 outliers have been
added to the data for period 2, excess noise added to one lot in
period 4, and deterministic laboratory error to period 6.
Blinded data from a clinical laboratory.
1 2 3 4 5 6
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