SamplingDesignTools: Tools for Dealing with Complex Sampling Designs

match_risk_table

R Documentation

<Private function> Match number at risk at coarsened time to NCC cases

<Private function> Match number at risk at coarsened time to NCC cases

match_risk_table(
  ncc_cases,
  risk_table_manual,
  t_coarse_name,
  t_name,
  match_var_names = NULL
)

`ncc_cases`	Cases in NCC data. A `data.frame` or a matrix with column names. This data should not include the ID of each matched set.
`risk_table_manual`	A `data.frame` with columns `t_event` (unique event times, possibly coarsened), `n_at_risk` (number of subjects at risk at each `t_event` in the underlying cohort), and additional columns for matching variables, if any. Make sure the matching variables have the same column names as in `ncc_cases` and `match_var_names`.
`t_coarse_name`	Name of the column of event time in each matched set in `ncc`, possibly coarsened to the same level as `t_event` in `risk_table_manual`. A `string`.
`t_name`	Name of the column of the exact event time. A `string`.
`match_var_names`	Name(s) of the match variable(s) in `ncc_cases` used when drawing the NCC. A `string` vector.

Returns a data.frame with the following columns:

t_event: Unique event times (exact, not coarsened).
n_event: Number of events at each event time.
n_at_risk: Number of subjects at risk at each event time.
strata: Strata defined by matching variables. match_var=1 if the NCC is only time-matched.
<each matching variable>: If the NCC is matched on additional confounders, each matching variable will be included as a column to the right of strata.