df <- data.frame(A = 1, B = 2)
summarise_var_by_strat(df, vars = c("A", "B"), new_var = "C")
df <- data.frame(A1 = 1, B1 = 1, A2 = 1, B2 = 1, A3 = 1, B3 = 1)
summarise_var_by_strat(df, vars = c("A", "B"), strat = 3, new_var = "C")
summarise_var_by_strat(df, vars = c("A", "B"), strat = 3, new_var = "C", summary_var = TRUE)
Run the code above in your browser using DataLab