BMisc (version 1.4.9)

get_YiGmin1: get_YiGmin1

Description

A function to calculate outcomes for units in the period right before they become treated (this function can also be used to recover covariates, etc. in the period right before a unit becomes treated). For units that do not participate in the treatment (and therefore have group==0), they are assigned their outcome in the last period.

Usage

get_YiGmin1(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$YiGmin1 <- get_YiGmin1(dta, idname = "id", yname = "y",
                            tname = "t", gname = "group")
head(unique(dta[, c("id", "group", "YiGmin1")]))