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These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.The independent variable is the one that is changed by the scientist.To ensure a fair test, a good experiment has only one independent variable.n experiment usually has three kinds of variables: independent, dependent, and controlled. The independent variable is the one that is changed by the scientist. To ensure a fair test, a good experiment has only one independent variable.
Types of Variables. Binary variable Obsevations (i.e., dependent variables) that occur in one of two possible states, often labelled zero and one. E.g., âimproved/not improvedâ and âcompleted. task/failed to complete task.â. Categorical Variable Usually an independent or predictor variable that contains values indicating.