LC_logit                Lethal Concentration Logit
LC_probit               Lethal Concentration Probit
LT_logit                Lethal Time Logit
LT_probit               Lethal Time Probit
lamprey_time            Lethal time data for seasonal exposure to TFM
                        for larval sea lamprey
lamprey_tox             Lethal concentration data for seasonal exposure
                        to TFM for larval sea lamprey
ratio_test              Ratio test
