nest_tdc: Create nested data frame from data with time-dependent...
In adibender/ped: What the Package Does (One Line, Title Case)

Provides methods to nest data with time-dependent covariates (TDCs). A formula must be provided where the right hand side (RHS) contains the structure of the TDCs

nest_tdc(data, formula, ...)

## Default S3 method:
nest_tdc(data, formula, ...)

## S3 method for class 'list'
nest_tdc(data, formula, ...)

`data`	A suitable data structure (e.g. unnested data frame with concurrent TDCs or a list where each element is a data frame, potentially containing TDCs as specified in the RHS of `formula`). Only TDCs present in `formula` will be returned.
`formula`	A two sided formula with a two part RHS, where the second part indicates the structure of the TDC structure.
`...`	Further arguments passed to methods.
`vars`	A character vector of TDCs that will be nested.
`id`	A character giving the name of the ID column.