Complex survey version of create_qgroups. Relies heavily on the
survey package [1,2].
create_qgroups_svy(x, groups = 4, probs = seq(1/groups, 1 - 1/groups,
1/groups), strata = NULL, design, svyquantile_list = list(na.rm =
TRUE), cut_list = list(include.lowest = TRUE))Numeric vector.
Numeric value, e.g. 3 for tertiles, 4 for quartiles, etc.
Numeric vector.
Factor specifying subgroups to calculate quantiles within. For
multivariable subgroups, you can use interaction.
Survey design object.
Arguments to pass to
svyquantile.
Arguments to pass to cut.
Factor variable.
1. Therneau, T. (2015). A Package for Survival Analysis in S. R package version 2.38. https://cran.r-project.org/package=survival.
2. Therneau, T.M. and Grambsch, P.M. (2000). Modeling Survival Data: Extending the Cox Model. Springer, New York. ISBN 0-387-98784-3.