Psych Stats Measurement Handout

Psych Stats Measurement Handout - To put this variable onto...

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Scales of Measurement Measurement . An orderly assignment of a numerical value to a characteristic. Scale of Measurement . Ordered set of possible numerical values that can be obtained by the measurement process. E.g., to measure height, we assign a number to the height of an individual through some systematic process. To do so, we use some scale of measurement, such as number of inches or centimeters. To measure I.Q., we might use a standardized test of I.Q., which we administer and give to people. Based on the number of questions a person got right, we assign an I.Q. value from, say 20 to 180. To measure dominance rank in a preschool, we might count the number of instances a child got his way with another child during free-play periods, and then order children from most to least on this measure. The scale would be a rank from 1 to n, where n is the number of children in the preschool. To measure sex, we might ask people whether they’re male or female.
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Unformatted text preview: To put this variable onto a measurement scale, we then might arbitrarily assign 1 = female and 2 = male. Properties of Measurement Scales . Scales of measurement differ in their properties. Three properties of measurements scales are: Magnitude . A scale has magnitude when one instance of the attribute being measured can be judged to be greater, less than, or equal to another instance. E.g., measurement scales of height have magnitude. Equal intervals . Here, the magnitude of the attribute represented by a unit of measurement on the scale is the same regardless of where on the scale the unit falls. Absolute zero point . A value indicates that nothing at all of the attribute being measured exists. Types of Measurement Scales . Which properties a scale possesses determines the type of scale it is. __Magnitude Equal Intervals Absolute Zero Point_ Ratio Scale Yes Yes Yes Interval Scale Yes Yes No Ordinal Scale Yes No No Nominal Scale No No No...
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This note was uploaded on 04/03/2008 for the course PSYCH 200 taught by Professor Gangestad during the Spring '08 term at New Mexico.

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