Presentation on theme: "Measurement and Scaling Concepts"— Presentation transcript: 1 Measurement and Scaling Concepts Show
2 Measurement
Measurement is the process of describing some property of a phenomenon of interest, usually by assigning numbers in a reliable and valid way. The numbers convey information about the property being measured. When numbers are used the researcher must have a rule for assigning a number to an observation in a way that provides accurate description.
3 We measure attributes of object. We do not measure objects .
4 A generalized idea that represent something of meaning.
5 Operational Definition
6 Constructs A construct is a term used for concepts that are measured with multiple variables.
Constructs are not directly measured. Constructs are measured through indicator variables. 7 Scale Series of items arranged according to value for the purpose of
quantification A continuous spectrum 8 Levels of Scale Measurement 9 Nominal, Ordinal, Interval, and Ratio Scales Provide Different
Information 10 Nominal Scale Properties
11 Nominal Scale 12 Ordinal Scale Properties 13 Ordinal Scale
14 Interval Scale Properties
15 Interval Scale 16 Ratio Scale Properties 17 Ratio Scale 18 Three Criteria for Good Measurement 19 Facts About the Four Levels of Scales
20 Facts About the Four Levels of Scales (cont’d)
21 Three Criteria for Good Measurement
22 Measurement Accuracy: Reliability 23 Methods for Measuring Reliability 24 Methods for Measuring Internal Consistency
25 Measuring Stability Test-retest Method 26
Measurement Accuracy: Validity (cont’d) 27 Approaches to Establishing Validity 28 Measurement Accuracy: Validity (cont’d) 29
Measurement Accuracy: Validity (cont’d)
30 EXHIBIT 13.7 Reliability and Validity on Target 31 Measurement Accuracy: Sensitivity What is the process of describing some property of a phenomenon usually by assigning numbers in a reliable and valid way?Measurement is the process of describing some property of a phenomenon of interest, usually by assigning numbers in a reliable and valid way. The numbers convey information about the property being measured.
Which type of measure assigns a value to an observation based on mathematical?an index assigns a value based on how much of the concept being measured is associated with an observation. Indexes are formed by putting several variables together systematically.
Is the process of identifying scale devices that correspond to properties of a concept involved in a research process?Correspondence analysis is the process of identifying scale devices that correspond to properties of a concept involved in a research process. A construct is a term used for concepts that are measured with single variables.
Which type of measure reflects the intensity of a concept by assigning scores?A continuous scale measures intensity of a concept. Value can be assigned using an infinite number of values anywhere along a scale.
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