Added support for bootstrapping error metrics for forecasted data: run_eval() now returns a bootstrap_summ element with point and 95% confidence interval estimates for each error metric (e.g., RMSE, MPE, etc.). Bootstrapping is configured through the new bootstrap argument of stats_summ_options() (see bootstrap_options(); off by default). The lower-level bootstrap_metrics() and summarise_bootstrap_metrics() functions, as well as calculate_bootstrap_summ(), are also exported for general use. (#47)
Added accuracy() statistic for calculating the proportion of predicted drug concentrations that fall within specified absolute and relative error margins. This statistic will only be calculated in run_eval() when the absolute and relative error margins have been specified in the .stats_summ_options argument (see stats_summ_options()). (#30)