obs1: simulated observed data
obs1a dataframe with 3000 rows and 8 variables
individual id number
true response, factor variable
true error-prone covariate, factor variable
error-free covariate
serial number of each visit
observed response, same as Y when in the validation set(delta=1)
observed error-prone covariate, same as X when in the validation set (delta=1)
indicator variable, 1 if in the validation set, 0 if not.