Perhaps you should try some spelling variations:
logistic model » logic model
rabbit model » rabbit hole
logit models » logic model
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 (logit 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 (logit models))))) or (logistic model))".
• Adding a wildcard symbol may retrieve word variants: ((((((tobit model) or (rabbit model))) or (((probit models) OR (logit models))))) or (logistic model))*.