Dichotomous scale

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Dichotomous scale - type of measurement scale, special case of nominal scale. The variables are on a dichotomous scale when they only take two values.

Examples of dichotomous variables: gender, answers to yes / no questions.

The nominal variable can be transformed into a sequence of dichotomous variables using binarization.

There are special statistical methods adapted to the dichotomous scale, eg chi square. There are also many methods for predicting the value of variables on this scale, eg logistic regression, classification trees.

Unlike other variables on a nominal scale, some methods adjusted to the quotient scale can also be used for dichotomous variables when coded as 0 and 1.

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