AOQL_grab_A             Construction of AOQ curve and calculate AOQL
                        value based on limiting fraction
AOQL_grab_B             Construction of AOQ curve and calculate AOQL
                        value based on average microbial counts
compare_plans           Probability of detection or non detection
                        versus fraction nonconforming curve
compare_plans_oc        Comparison based on OC curve
correlation_grab        Serial correlation between grab samples
oc_plan                 Construction of Operating Characteristic (OC)
                        curve
prob_accept             Probability of acceptance for grab sampling
                        scheme
prob_contaminant        Probability of contaminated sample
prob_detect             Probability of detection under the grab
                        sampling method
prob_detect_single_grab
                        Probability of detection in a single grab
                        sample
