quiz 4

Question 1

how to find total variance

Answer 1

TOTAL VARIANCE = (always 100%)
COMMON VARIANCE
\+ 
SPECIFIC VARIANCE
\+
ERROR VARIANCE

Question 2

what is common variance

Answer 2

percentage of total variance in a test (1.00) that is shared with the other tests in the factor analysis

Question 3

what is error variance

Answer 3

percentage of total variance in a test that is due to random measurement error

Question 4

what is specific variance

Answer 4

percentage of total variance in a test that is unique to that test and not shared with the other tests in the factor analysis

Question 5

how to find common variance

Answer 5

-CV = Sum of the squared factor loadings for that test

Example: Loading of a test on Factor I is .9 and loading on Factor II is -.1
-Common Variance = (.9)2 + (-.1)2 = .81 + .01 = .82

This means that 82% of the variance of this test is shared with the other tests that were included in the factor analysis

Question 6

how to find error variance

Answer 6

• Subtract the reliability of the test from 1.00
• In most instances it is given to you, we will eventually learn how to calculate it
• If reliability is .90, then the error variance is 1.00 minus .90 or 0.10

Question 7

how to calculate specific variance

Answer 7

• Step One. Calculate the common variance (CV) and the error variance (EV)
• Step Two. Add the CV and EV
• Step Three. Subtract the result of Step 2 from 1.00