Information Technology Reference
In-Depth Information
Within - Subjects Factors
Measure: MEASURE_1
Dependent
Variable
DRINKS
VEHICLE
1
1
2
3
1
2
3
CAR0
CAR1
CAR3
SUV0
SUV1
SUV3
2
Figure 11.12
Descriptive statistics.
Descriptive Statistics
Std.
Deviation
Mean
1.0000
4.0000
7.5000
1.3333
4.5000
5.0000
N
CAR0
CAR1
CAR3
SUV0
SUV1
SUV3
.89443
1.78885
1.64317
.51640
1.51658
1.41421
6
6
6
6
6
6
The
Descriptive Statistics
table presents the observed means, standard
deviations, and sample sizes for each condition.
Figure 11.13 presents the results of
Mauchly's Test of Sphericity
.
Recall that Mauchly's test simultaneously evaluates two assumptions:
(a) that the levels of the within-subjects variable have equal variances
(i.e., that there is homogeneity of variance); and (b) that the levels of the
Mauchly's test was not
significant for both the main
effect and interaction. We
therefore can assume that
we have met the sphericity
assumption.
Mauchly's Test of Sphericity
b
Measure: MEASURE_1
Epsilon
a
Approx.
Chi-Square
Greenhous
e-Geisser
Lower-
bound
Mauchly's W
Huynh-Feldt
Within Subjects Effect
VEHICLE
DRINKS
VEHICLE * DRINKS
df
Sig.
1.000
1.000
.815
0
2
2
Tests the null hypothesis that the error covariance matrix of the orthonormalized transformed dependent
variables is proportional to an identity matrix.
a. May be used to adjust the degrees of freedom for the averaged tests of significance. Corrected tests
are displayed in the Tests of Within-Subjects Effects table.
b. Design: Intercept
Within Subjects Design: VEHICLE+DRINKS+VEHICLE*DRINKS
1.000
.972
.496
.000
.113
2.801
1.000
.973
.665
1.000
.500
.500
.945
.246
Figure 11.13
Mauchly's test of sphericity.
