cont_two_by_two_subset: Continuous Two-by-Two Subset

Description

A function for computing a 2x2 subset of original data. This function is adapted from ptetools::two_by_two_subset and allows for the treatment to be continuous. This is the subset with post treatment periods separately for the treated group and comparison group and pre-treatment periods in the period immediately before the treated group became treated.

Usage

cont_two_by_two_subset(
  data,
  g,
  tp,
  control_group = "notyettreated",
  anticipation = 0,
  base_period = "varying",
  ...
)

Value

list that contains correct subset of data, n1

number of observations in this subset, and disidx a vector of the correct ids for this subset.

Arguments

data: the full dataset
g: the current group
tp: the current time period
control_group: whether to use "notyettreated" (default) or "nevertreated"
anticipation: the number of periods of anticipation (i.e., number of periods before the treatment happens where the treatment can "already" affect the outcome)
base_period: The type of base period to use. This only affects the numeric value of results in pre-treatment periods. Results in post-treatment periods are not affected by this choice. The default is "varying", where the base period will "back up" to the immediately preceding period in pre-treatment periods. The other option is "universal" where the base period is fixed in pre-treatment periods to be the period right before the treatment starts. "Universal" is commonly used in difference-in-differences applications, but can be unnatural for other identification strategies.
...: extra arguments to get the subset correct