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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 flowchart: 1  A continuous variabl e is a numeric variable. 2  A discrete variable is a numeric variable. 3  An ordinal varia ble is a categorical variable. 4  A nominal variable is a categorical variable. Examples of continuous variables include height, time, age, and temperature. 2  A discrete variable is a numeric variable. 3  Observations can take a value based on a count from a set of distinct whole values.