Fig. 1
From: Crude incidence in two-phase designs in the presence of competing risks
Estimated and empirical variances. Comparison between estimated and empirical variance under random (panel a), case-control (panel b), stratified (panel c) and nested case-control sampling (m=1, panel d). For the first three scenarios a sample size of 100 was used, while in the nested case-control sampling a mean of 180 subjects was considered. Data were subject to a random censoring of 15 % (plus administrative censoring). Dashed lines represent the main bisector corresponding to the equality between estimated and empirical reference