Data from an ELISA assay
Observed signals and (for some observations) nominal concentrations for samples that were aliquoted to multiple assay plates, which were read multiple times on multiple days.
a data frame with the following columns:
PlateDayfactor. Specifies one of four physically disctinct 96 well plates
Readfactor. The signal was read 3 times for each plate.
Descriptioncharacter. Indicates contents of sample.
Concentrationnumeric. Nominal concentration of standards (NA for all other samples).
Signalnumeric. Assay signal. Specifically, optical density (a colorimetric assay).