eFigure 3.

(available online only). Agreement between different calibration approaches in 943 serum samples from the Collaborative Perinatal Project after elimination of three outliers from the calibration experiment data: GCSF concentration in picograms per millileter.

The top panels show linear RC linear models for collapsed compared with batch-specific fixed-effects models (panel a) and compared with mixed models (panel b). The bottom panels show IRC fit curvilinear models for collapsed compared with batch-specific fixed-effects models (panel c) and compared with mixed models (panel d). The solid diagonal line reflects perfect agreement.