get_Yibar_pre: get_Yibar_pre

In BMisc: Miscellaneous Functions for Panel Data, Quantiles, and Printing Results

get_Yibar_pre

Description

A function to calculate average outcomes for units in their pre-treatment periods (this function can also be used to recover pre-treatment averages of covariates, etc.). For units that do not participate in the treatment (and therefore have group==0), the function calculates their overall average outcome.

Usage

get_Yibar_pre(df, idname, yname, tname, gname)

Arguments

df	the data.frame used in the function
idname	name of column that holds the unit id
yname	name of column containing the outcome (or other variable) for which to calculate its outcome in the immediate pre-treatment period
tname	name of column that holds the time period
gname	name of column containing the unit's group

Examples

n <- 50
id <- rep(seq_len(n), each = 4)
t <- rep(1:4, n)
y <- rnorm(n * 4)
g <- rep(sample(c(0, 2, 3), n, replace = TRUE), each = 4)
dta <- data.frame(id = id, t = t, y = y, group = g)
dta$Yibarpre <- get_Yibar_pre(dta, idname = "id", yname = "y",
                               tname = "t", gname = "group")

BMisc documentation built on Aug. 22, 2026, 5:07 p.m.