review levels

review levels - LEVELSOFMEASUREMENT DEFININGMEASUREMENT...

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LEVELS OF MEASUREMENT Copyright 2010 Margaret DeFleur
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DEFINING MEASUREMENT Measurement is . . . The assignment of numerals to represent properties or characteristics of objects or events In short, it is the substitution of numbers for something but this “something” is often abstract and invisible So, we must design a system of numbers – called a metric or scale – to reflect the properties - + |-----|-----|-----|-----|-----|-----|-----|-----|-----| 2 MC3018 Foundations of Media
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PROPERTIES OF NUMBERS MC3018 Foundations of Media 3 1. Numbers are “ordered” Ex.: 1<2<3<4; 8>7>6>5 . . . 2. The difference/distances between numbers are equal 3. Numbers have a unique (zero) origin Isomorphism: A direct (1 to 1) correspondence between the variable and the scale
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PROPERTIES OF NUMBERS MC3018 Foundations of Media 4 Our scale should reflect all of the properties of numbers: - + . . . |----|----|----|----|----|----|----|----|----|----| . . . 0 5 10 15 20 25 30 35 40 45 50 And represent how the variable acts in reality
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PROPERTIES OF NUMBERS MC3018 Foundations of Media
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review levels - LEVELSOFMEASUREMENT DEFININGMEASUREMENT...

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