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Function to recreate the expand function in Stata

stata_expand.Rd

Takes a dataframe and duplicates it n times, then creates a variable (default name is Duplicate) which has a value of 0 if the observation originally appeared int he dataset and i = 1,..,n for each duplicate.

Usage

stata_expand(df, n, name = "Duplicate")

Arguments

df

Data frame

n

Number of times to duplicate (i.e. to end up with 2 copies of everything then n = 1)

name

Character string indicating the name of the variable indicating which rows are duplicates

Value

A data frame

Examples

df <- data.frame(x = 1:5, y = c("a","b","c","d", "e"))
stata_expand(df, 1)
#>    x y Duplicate
#> 1  1 a         0
#> 2  2 b         0
#> 3  3 c         0
#> 4  4 d         0
#> 5  5 e         0
#> 6  1 a         1
#> 7  2 b         1
#> 8  3 c         1
#> 9  4 d         1
#> 10 5 e         1