Use to specify stratification variables for VPC.
Usage
stratify(o, ...)
# S3 method for class 'tidyvpcobj'
stratify(o, formula, data = o$data, data.sim = NULL, ...)Arguments
- o
A
tidyvpcobj.- ...
Other arguments to include.
- formula
Formula for stratification.
- data
Observed data supplied in
observed()function.- data.sim
Simulated data supplied in
simulated()function.
Value
Returns updated tidyvpcobj with stratification formula, stratification column(s), and strat.split datasets, which
is obs split by unique levels of stratification variable(s). Resulting datasets are of class object data.frame
and data.table.
Examples
# \donttest{
require(magrittr)
vpc <- observed(obs_data, x=TIME, y=DV) %>%
simulated(sim_data, y=DV) %>%
stratify(~ GENDER) %>%
binning(NTIME) %>%
vpcstats()
# Example with 2-way stratification by GENDER and STUDY.
vpc <- vpc %>%
stratify(~ GENDER + STUDY) %>%
binning(bin = "centers", centers = c(1,3,5,7,10)) %>%
vpcstats()
# }