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types of variables-psychology research

types of variables-psychology research - TYPES OF VARIABLES...

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TYPES OF VARIABLES VARIABLES Operational definition: definition of an abstract concept that allows measurement or manipulation of the concept in a research study Example: intelligence – measure by the IQ test score, GPA, accuracy on problem solving task, etc. SCALES OF MEASUREMENT There are four primary scales of measurement. The one that you choose will affect the type of statistics that you run. Nominal: o Non-ordered category responses Men vs. women; day vs. night How do you feel today? (Circle one.) Happy, sad, anxious, excited o Nominal data are qualitative Ordinal: o Rank ordered category responses o Responses are not necessarily equally spaced o How do you feel today? (Circle one.) Very sad, sad, neutral, happy, very happy o Ordinal data are qualitative Interval: o Equally spaced, numerical responses; values are not ratio relations of one another o Example Rate how happy you are today: 1-5; 1 = least happy, 5 = most happy IQ is data collected on an interval scale. Temperature collected on Fahrenheit or Celsius is on an interval scale. o Interval data are quantitative data o Likert Scale Give the participant an option of data Ratio: o
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