sdid_placebo_cpp: Fast Placebo Test for SDID

In coresynth: Fast and Unified Synthetic Control Methods

Fast Placebo Test for SDID

Description

For each control unit, treats it as the "pseudo-treated" unit and estimates the leave-one-out SDID effect. The distribution of these placebo effects provides a permutation-based null distribution for inference.

Usage

sdid_placebo_cpp(Y_pre, Y_post, time_weights, zeta2)

Arguments

Y_pre	Control units pre-treatment outcomes (T_pre x N_co)
Y_post	Control units post-treatment outcomes (T_post x N_co)
time_weights	Lambda weights for pre-treatment periods (T_pre x 1)
zeta2	Ridge penalty (same as used in the main estimate)

Value

A numeric vector of length N_co. Each element is the leave-one-out placebo SDID effect obtained by treating that control unit as the pseudo-treated unit; the vector serves as a permutation-based null distribution for inference.

coresynth documentation built on Aug. 28, 2026, 1:06 a.m.