library("matchatr")
counter_matched(strata = "exposure_surrogate", time = "t")<matchatr_design>
Type: Counter-matched
Strata: exposure_surrogate
Time: t
Weights: counter-matchingCounter-matched design
Description
Declares a counter-matched nested case-control sample: a stratified risk-set design in which controls are sampled to differ from the case on a surrogate of exposure, balancing each sampled risk set across exposure strata. The analysis is a weighted Cox partial likelihood that carries the counter-matching inclusion weights.
Usage
counter_matched(strata, time, ratio = NULL)
Arguments
strata
|
A non-empty character vector naming the counter-matching surrogate stratum column(s). |
time
|
A single character string naming the event/entry time column that defines the risk sets. |
ratio
|
NULL or a single whole number >= 1. Controls sampled per case within the counter-matched strata.
|
Value
A matchatr_design object of type “counter_matched” carrying the strata, time, and ratio, with a weight_spec flagged for counter-matching weights.
See Also
nested_cc(), matcha()
Other design constructors: case_cohort(), matched_cc(), nested_cc(), two_phase(), unmatched_cc()