set.seed(123)
panel <- data.frame(
year = rep(2000:2002, 3),
sector = rep(c("A", "B", "C"), each = 3),
log_direct = rnorm(9, mean = 5),
log_production = rnorm(9, mean = 5)
)
panel_mundlak <- create_mundlak_data(panel)
head(panel_mundlak)
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