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CI for ICC

Posted by Bill Wu on Feb 14, 2011; 10:14pm
URL: http://spssx-discussion.165.s1.nabble.com/CI-for-ICC-tp3385127.html

How does SPSS calculate confidence interval for ICC?  I have the following output.
Thanks in advance.

Bill

ANOVA

 

Sum of Squares

df

Mean Square

F

Sig

Between People

76.867

19

4.046

 

 

Within People

Between Items

9.567

5

1.913

3.058

.013

Residual

59.433

95

.626

 

 

Total

69.000

100

.690

 

 

Total

145.867

119

1.226

 

 

Grand Mean = 2.6333

Intraclass Correlation Coefficient

 

Intraclass Correlationa

95% Confidence Interval

F Test with True Value 0

Lower Bound

Upper Bound

Value

df1

df2

Sig

Single Measures

.477b

.290

.690

6.467

19

95

.000

Average Measures

.845c

.710

.930

6.467

19

95

.000

Two-way mixed effects model where people effects are random and measures effects are fixed.

a. Type C intraclass correlation coefficients using a consistency definition-the between-measure variance is excluded from the denominator variance.

b. The estimator is the same, whether the interaction effect is present or not.

c. This estimate is computed assuming the interaction effect is absent, because it is not estimable otherwise.