Measurement and Sampling

1
Chapter 4

• Measurement and Sampling

2
Evaluating measures

• Reliability repeatability
• Minimum requirement
• Error
• Measurement error
• Systematic error
• Ways to measure reliability
• procedures

3
Evaluating measures

• Validity measuring what you intend to measure
• Face validity
• Criterion validity
• Construct validity experimental research
• Relationship between reliability and validity

4
Scales of measurement

• Nominal scale categories
• Ordinal scale rankings
• Interval scale equal intervals between events
• Ratio scale contains a zero point

5
Sampling

• Population vs. Sample
• Representativeness
• self-selection
• Probability sampling
• random sample
• stratefied sample
• cluster sample
• Non-probability sampling