Two mutually exclusive or contradictory categories. (like when you flip a coin)
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Dichotomous means "having only two possible values." Examples of dichotomous variables are yes/no or male/female.
It is a dichotomous variable.
In cases wherethe dependent variable can take any numerical value for a given set of independent variables multiple regression is used.But in cases when the dependent variable is qualitative(dichotomous,polytomous)then logistic regression is used.In Multiple regression the dependent variable is assumed to follow normal distribution but in case of logistic regression the dependent variablefollows bernoulli distribution(if dichotomous) which means it will be only0 or 1.
If there are only two variables, then the dependent variable has only one variable it can depend on so there is absolutely no point in calculating multiple regression. There are no other variables!
Dichotomous is an adjective. It describes something broken into two parts.