Previous Table of Contents Next


TABLE 23.5 ANOVA Table for the Paging Study

Component Sum of
Squares
Percentage of
Variation
Degrees of
Freedom
Mean
Square

y 730.01 81
681.21 1
48.80 100 80
Main effects 45.80 93.85 8 5.7
A 1.30 2
D 6.10 2
P 12.30 2
M 26.20 2
First-order interactions 2.40 4.91 24 0.1
AD 0.07 4
AP 0.02 4
AM 0.03 4
DP 0.15 4
DM 1.96 4
PM 0.14 4
Second-order
interactions
0.48 0.98 32 0.015
ADP 0.05 8
ADM 0.13 8
APM 0.04 8
DPM 0.26 8
Third-order interaction
(ADPM)
0.07 0.14 16 0.004

Data from Tsao and Margolin (1971). Reprinted with permission.
TABLE 23.6 Interactions between Deck Arrangement and Memory Pages

M1 M2 M3

D1 0.11 -0.30 0.19
D2 -0.05 0.09 -0.04
D3 -0.06 0.21 -0.15

where μ is the grand mean; αi, βj, γk, and δl are the main effects of factors A, D, P, and M, respectively; and ξjl is the interaction between D and M. The estimated values of these interactions at various combinations of factors D and M are shown in Table 23.6. The difference between the estimated response using the model and the measured response is the error. The errors in all 81 observations are shown in Table 23.7. A normal quantile-quantile plot of the residuals is shown in Figure 23.1. Notice that the plot is almost a straight line. There is one observation that is significantly away from the line followed by other points. This experiment was repeated to verify that it was not a mistake.


Previous Table of Contents Next

Copyright © John Wiley & Sons, Inc.