Clinical Biochemistry of Domestic Animals (Sixth Edition) - UMK ...

20
Chapter | 1 Concepts of Normality in Clinical Biochemistry
General Linear Model
Source
Descriptive Statistics
Mean Std. Deviation N
placebo 42.3000 5.01221 10
tcc 51.1000 1.91195 10
acd 60.2000 3.11983 10
Measure: count
Tests of Within-Subjects Effects
Type III Sum
of squares
df Mean Square F Sig.
cocktail Sphericity Assumed 1602.200 2 801.100 82.336 .000
Greenhouse-Geisser 1602.200 1.283 1248.576 82.336 .000
Huynh-Feldt 1602.200 1.404 1141.393 82.336 .000
Lower-bound 1602.200 1.000 1602.200 82.336 .000
Error(cocktail) Sphericity Assumed 175.133 18 9.730
Greenhouse-Geisser 175.133 11.549 15.164
Huynh-Feldt 175.133 12.634 13.863
Lower-bound 175.133 9.000 19.459
Measure: count
Pairwise Comparisons
(I) cocktail (J) cocktail Mean
Difference
(IJ)
Std. Error Sig a 95% Confidence Interval
Lower Bound Upper Bound
1 2 8.800* 1.672 .002 13.704 3.896
3 17.900* 1.595 .000 22.578 13.222
2 1 8.800* 1.672 .002 3.896 13.704
3 9.100* .706 .000 11.172 7.028
3 1 17.900* 1.595 .000 13.222 22.578
2 9.100* .706 .000 7.028 11.172
Based on estimated marginal means
* The mean difference is significant at the .05 level.
a Adjustment for multiple comparisons: Bonferroni.
FIGURE 1-14 Partial SPSS printout of the analysis of variance for comparing the three groups of Example 5
assuming a repeated measures design.
specified for the repeated measures factor in the Within-
Subject Factor Name box. Then the number of categories
of the Within-Subject Factor, here 3, is specified in the
Number of Levels box. This information is registered [here
as cocktail(3) ] by hitting the Add tab. Hitting the Define
tab opens the Repeated Measures dialog box where the
columns of the worksheet corresponding to the levels
of the repeated measures factor, here placebo , tcc , and
acd3s , are moved into the Within-Subject Variables box.
Hitting the Options tab opens the Repeated Measures:
Options dialog box. In this dialog box, the repeated measures
factor, here cocktail , is moved from the Factor(s)
and Factor Interactions: box to the Display Means for:
box. Compare main effects is selected, Confidence interval
adjustment method (here Bonferroni ) is specified,
and other display options such as the Descriptive statistics
are requested. The Continue tab is hit to return to the
Repeated Measures dialog box and the OK tab is hit to
get the output.]
A partial printout of the SPSS output for the example
is presented in Figure 1-14 . The variance ratio, F 82.3,
is larger than the 62.4 obtained from the One-way ANOVA
of the data obtained assuming a completely randomized
design. This is due the smaller error, 9.730, obtained with
the analysis of the data obtained under the repeated measures
design compared to that (12.837) obtained from the
One-way ANOVA. This difference is because sizable variability
due to animal, the block was removed from the error
in the analysis of the data assuming the repeated measures
design.