2. Computing Reliability
AGENDA
Levels of Measurement
Computing Reliability

3. Nominal Level Measurement
numbers used as ways to identify or name categories
numbers do not indicate degrees of a variable but simple groupings of variables
equivalent to qualitative data
Slide 8.1

4. Ordinal Level Measurement
uses rank order to determine differences
measures whether items are “greater than” or “less than” other items
identifies relations of measured items to each other
Slide 8.2

5. Interval Level Measurement
distances between measured items are identified by a matter of degree
allows meaningful arithmetic to be applied
measures whether items are “greater than” or “less than” other items
permits identifying the ratio of intervals to each other
Slide 8.3

6. Ratio Level Measurement
distances between measured items are identified by a matter of degree
a true quantitative scale and includes an “absolute zero”
allows meaningful arithmetic to be applied
measures whether items are “greater than” or “less than” other items
permits identifying the ratio of intervals to each other
Slide8.4

7. Computing Reliability
AGENDA
Levels of Measurement
Computing Reliability

8. Coefficient Alpha
Slide 8.5A

9. Coefficient Alpha
Slide 8.5B

10. Coefficient Alpha
Slide 8.5C

11. Coefficient Alpha
Slide 8.5D

12. Coefficient Alpha
Slide 8.5