A standard test is observed on all specimens.  We treat the second test (or sampled test) as being conducted on only a stratified sample of specimens.  Verification Bias is this situation when the specimens for doing the second (sampled) test is not under investigator control.  We treat the total sample as stratified two-phase sampling and use inverse probability weighting.  We estimate diagnostic accuracy (category-specific classification probabilities; for binary tests reduces to specificity and sensitivity, and also predictive values) and agreement statistics (percent agreement, percent agreement by category, Kappa (unweighted), Kappa (quadratic weighted) and symmetry tests (reduces to McNemar's test for binary tests)).  See: Katki HA, Li Y, Edelstein DW, Castle PE.  Estimating the agreement and diagnostic accuracy of two diagnostic tests when one test is conducted on only a subsample of specimens. Stat Med. 2012 Feb 28; 31(5) <doi:10.1002/sim.4422>.

Comparison of Cumulative Incidence Between Two Groups Under
Competing Risks
c(person("Jingjing", "Lyu", role = "aut", email="lyu.j@foxmail.com"), person("Zheng", "Chen", role = "cre", email="zheng-chen@hotmail.com"), person("Jinbao", "Chen", role = "ctb"), person("Yawen", "Hou", role = "ctb"))
Statistical methods for competing risks data in comparing cumulative incidence function curves between two groups, including overall hypothesis tests and arbitrary tests in Lyu et al. (2020) <doi:10.1002/pst.2028>, and the fixed-point tests in Chen et al. (2018) <doi:10.1080/03610918.2018.1476697>.
Jingjing Lyu [aut],
Zheng Chen [cre],
Jinbao Chen [ctb],
Yawen Hou [ctb]

Comparison of Survival Curves Between Two Groups
c(person("Zheng", "Chen", role = c("aut","cre"),
email="zchen@smu.edu.cn"),
person("Jingjing", "Lyu", role = "ctb",
email="lyu.j@foxmail.com"),
person("Huimin", "Li", role = "ctb"),
person("Jinbao", "Chen", role = "ctb"))
Various statistical methods for survival analysis in comparing survival curves between two groups, including overall hypothesis tests described in Li et al. (2015) <doi:10.1371/journal.pone.0116774>, fixed-point tests in Klein et al. (2007) <doi:10.1002/sim.2864>, short-term tests, and long-term tests in Logan et al. (2008) <doi:10.1111/j.1541-0420.2007.00975.x>. Some commonly used descriptive statistics and plots are also included.
Zheng Chen [aut, cre],
Jingjing Lyu [ctb],
Huimin Li [ctb],
Jinbao Chen [ctb]