A function that takes an original data set and keeps all
data for all groups that are not-yet-treated by period tp as well
as for group g.
In particular, this keeps more data than functions like two_by_two
subset that use a fixed base period.
A main use case for this function is the interactive fixed effects approach
proposed in Callaway and Tsyawo (2023).
Usage
keep_all_pretreatment_subset(data, g, tp, ...)
Arguments
- data
the full dataset
- g
the current group
- tp
the current time period
- ...
additional arguments
Value
list that contains the following elements:
gt_data: a gt_data_frame object that contains the
correct subset of data
n1: the number of observations in this subset
disidx: a vector of the correct ids for this subset
