Creates upper and lower percentiles by TIME for a given dataset
Source:R/functions.R
      quantile_output.RdCreates upper and lower percentiles by TIME for a given dataset
Usage
quantile_output(
  iiv_sim_input,
  yvar = "DV",
  lower_quartile = 0.025,
  upper_quartile = 0.975,
  dp = 5
)