Seed 20261011: 160 IDs, 1878 observed rows, 39 internal holes, calendar years 2010-2024. The input stays identical when arguments change.
Fixed covariates: log size, leverage and productivity. Fixed matching method: nearest neighbour. Fixed control pool rule: control_type = 'all'. Eligible control observations can still change when timing restrictions change.
Light grey = observed data; white = absent observations; green = treatment starts; red = retained treated observations; blue = retained controls. Match colors can cover green; blue opacity reflects reuse.
All 73,728 combinations of these displayed choices can be submitted to the real R function. Unsupported combinations show the function's error or an empty-match message; they are not replaced with an old graph. These plots illustrate sample construction, not causal identification.