Create a vpcdb object, and standardize parameter checking
as_vpcdb(..., type = NULL, facet = NULL, scales = NULL, labeller = NULL)A vpcdb object which is simply a named list with some of the values checked for correctness
Extra parameters (not checked) added to the object
The type of vpc (e.g. "continuous", "categorical", "censored", or "time-to-event")
either "wrap", "columns", or "rows"
Are scales shared across all facets (the default,
"fixed"), or do they vary across rows ("free_x"),
columns ("free_y"), or both rows and columns ("free")?
ggplot2 labeller function to be passed to underlying ggplot object