zinc: Example Study Nested within a Cohort: Zinc and Esophageal...

Description Usage Format Source References


zinc is a data frame, with some variables observed on all subjects, and some variables not. The outcome variable is ec01, indicating esophageal cancer or not at time futime01. The zinc variables are in zncent (continuous), znqt (ordinal zinc quartiles), or znquartiles (factor variable notating quartiles of zinc)




See nested.coxph for example of using this dataset.


Steven D. Mark


Christian C. Abnet, Barry Lai, You-Lin Qiao, Stefan Vogt, Xian-Mao Luo, Philip R. Taylor, Zhi-Wei Dong, Steven D. Mark, Sanford M. Dawsey. Zinc concentration in esophageal biopsies measured by X-ray fluorescence and cancer risk. Journal of the National Cancer Institute, 2005; 97(4) 301-306

NestedCohort documentation built on May 29, 2017, 9:40 a.m.