+ remember(sample.size, paste0(remember_prefix, "sample.size"))
+ remember(sample.prop, paste0(remember_prefix, "sample.prop"))
+ remember(pred_formula, paste0(remember_prefix, "pred_formula"))
+ remember(outcome_formula, paste0(remember_prefix, 'outcome_formula'))
+ remember(proxy_formula, paste0(remember_prefix, 'proxy_formula'))
+