Applied Multivariate Methods in Psychology Week 10 Supplement

Advanced topics in multivariate methods in psychology such as second-order factor analysis, Psych varimax, item factor analysis, and miniscales. Learn about tetrachoric/polychoric methods, EFA for Likert items, and data reading packages."

• Psychology
• Multivariate
• Factor Analysis
• Tetrachoric
• EFA

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1. CLP 6529, Applied Multivariate Methods in Psychology Week 10 R Supplement 1

2. Second-order factor analysis 2

3. Psych varimax and promax 3

4. Psych varimax and promax reason ufov memory reason ufov memory 4

5. Second order FA 5

6. Item Factor Analysis This is one of the most common wishes for factor analysis. I give a big test with lots of items, and I want to confirm that the items make up hypothesized subscales Unfortunately, even though factor analysis does not require normally distributed variables, items tend to be very ordinal or dichotomous Correct vs. incorrect (1,0) Not at all, somewhat, a great deal, very much (1-4) 6

7. Tetrachoric/Polychoric http://www.ottersbek.de/software/#r_tetra For more information on tetrachoric/polychoric, visit the URL above. It has some very thorough syntax, custom programs, etc. 7

8. Example: Personality in Intellectual Aging Contexts Inventory (PIC) Locus of control scale Internal Powerful others Chance These are Likert items (1-6), so a traditional EFA may not be TOO bad. 8

9. Miniscales and parceling Since Gorsuch, arguments have existed for not analyzing single items The idea is that if you can combine items into small groups, you can produce better distributed variables that will factor better These item groupings have been called miniscales or parcels How do you put them together? 9

10. Read data and packages 10

11. 3-factor item EFA 11

12. 3-factor item EFA 12

13. 3-factor item EFA 13

14. 3-factor item EFA 14

15. 2-factor item EFA 15

16. Parcels 16

17. Parcels 17

18. Parcels 18

19. Side issue: Item Response 19

20. Side issue: Item Response 20