Perhaps you should try some spelling variations:
logistic model » logic model
probit models » logit models
rabbit model » rabbit hole
tobit model » probit model, logit model

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((((((tobit model) OR (rabbit model))) OR (probit models))) OR (logistic model)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((tobit model) OR (rabbit model))) or (probit models))) or (logistic model))".
• Adding a wildcard symbol may retrieve word variants: ((((((tobit model) OR (rabbit model))) or (probit models))) or (logistic model))*.