numeric. Weight given to sensitivity, must range from 0 to 1.
cost.v
numeric. An optional vector of additional costs to be added to each case.
cost.outcomes
numeric. A vector of length 4 specifying the costs of a hit, false alarm, miss, and correct rejection rspectively. E.g.; cost.outcomes = c(0, 10, 20, 0) means that a false alarm and miss cost 10 and 20 respectively while correct decisions have no cost.