| did_sad | R Documentation | 
Function to implement DDID under the Staggered Adoption Design
did_sad(formula, data, id_subject, id_time, option)
formula | 
 A formula indicating outcome and treatment.  | 
data | 
 A long form panel data.  | 
id_subject | 
 A character variable indicating subject index.  | 
id_time | 
 A character variable indicating time index.  | 
Double DID estimates.
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