chapter 11
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McGraw-Hill/IrwinBusiness Research Methods, 10e
Copyright © 2008 by The McGraw-Hill Companies, Inc. All Rights Reserved.
Chapter 11Chapter 11
MeasurementMeasurement
11-2
Why Measurement Is Important
“If you can’t measure it, you can’t manage it.”
Bob Donath, Bob Donath and Co, Inc
11-3
Measurement
Selecting measurable phenomena
Developing a set of mapping rules
Applying the mapping ruleto each phenomenon
11-5
Levels of Measurement
OrdinalOrdinal
intervalinterval
RatioRatio
NominalNominal ClassificationClassification
11-7
Nominal Scales
• Mutually exclusive and collectively exhaustive categories
• Exhibits the classification characteristic only
11-8
Levels of Measurement
OrdinalOrdinal
intervalinterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
11-9
Ordinal Scales
• Characteristics of nominal scale plus an indication of order
• Implies statement of greater than and less than
11-10
Levels of Measurement
OrdinalOrdinal
intervalinterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
OrderOrderClassificationClassification DistanceDistance
11-11
Interval Scales
• Characteristics of nominal and ordinal scales plus the concept of equality of interval.
• Equal distance exists between numbers
11-12
Levels of Measurement
OrdinalOrdinal
intervalinterval
RatioRatio
NominalNominal ClassificationClassification
OrderOrderClassificationClassification
OrderOrderClassificationClassification DistanceDistance
Natural OriginNatural Origin
OrderOrderClassificationClassification DistanceDistance
11-13
Ratio Scales
• Characteristics of previous scales plus an absolute zero point
• Examples– Weight– Height– Number of children
11-16
Increasing Content Validity
ContentLiterature Search
Literature Search
Expert Interviews
Expert Interviews
Group Interviews
Group Interviews
Question DatabaseQuestion Database
Etc.Etc.
11-19
Judging Criterion Validity
RelevanceRelevance
Freedom from biasFreedom from bias
ReliabilityReliability
AvailabilityAvailability
Criterion
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