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A radio button is a type of survey response format used in electronic questionnaire media such as Web surveys, email surveys, personal digital assistant (PDA) applications, and other electronic documents. The radio button response format allows respondents to select one, and only one, of a set of two or more mutually exclusive response options. Respondents select the response option of interest by using a mouse pointer, keyboard key, or touch-screen stylus. The term radio button is a reference to the punch-in buttons invented years ago on radios to choose a preset station, such as in an automobile; as each new button is pressed, the previously pressed button is returned to the neutral position.

Radio buttons are often displayed as a series of open circles with a ...

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