Scales of Measurement What is a nominal scale? A scale that categorizes items What is an ordinal...
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Transcript of Scales of Measurement What is a nominal scale? A scale that categorizes items What is an ordinal...
Scales of Measurement What is a nominal scale? A scale that categorizes items
What is an ordinal scale?
A scale that categorizes and rank orders items
What is an interval scale?
A scale that categorizes and rank orders items, and has equal intervals
What is a ratio scale?
A scale that categorizes and rank orders items, has equal intervals, and a zero that means the absence or none of the thing being measured
Types of Variables
• Discrete Variables:– consists of separate categories
• Continuous Variables:– Variable that is not measured on distinct
categories
Real Limits
• A score on a continuous variables could fall anywhere on the scale, even between units– On a continuous scale of 1 to 5, it is possible to obtain a
2.5
• Real Limits are used to account for this possibility– They define boundaries at +/- half of a unit of the scale– If a scale is in units of 1, then the real limit is +/- 0.5 for
each score