Binary Data, Two Independent Groups, Cohort Design, Data Set-up
Data are stored in the form of a binary "exposure" (comparable to an independent
variable) and binary outcome ("disease" variable, comparable to a dependent
variable). Data are encoded in yes/no (<Y>), text, or numerically
form (with 1 = yes and 2 = no). If text codes are used to store data, make
certain that the exposed group and diseased group occur alphabetically
before the unexposed and non-disease groups, so the 2-by-2 table aligns
as expected.