
181Multivariate Analysis to Reduce Patient Waiting Time at a Medical Center
• Middle-bottom: The differences in the average waiting times among
the three procedures at Registration Desk 1 are higher than the dif-
ferences at Registration Desk 2.
• Middle-top: The difference in the average waiting times between
the two arrival times is higher at Registration Desk 2 than that at
Registration Desk 1.
MA
35
30
25
20
15
21
35
30
25
20
15
Arrival Time
Registration Desk
Procedure
Main Effects Plot for Waiting Time
Data Means
FIGURE 10.32
Main effects plot for Copley dermatology.
FIGURE 10.33
“Responses” and “Factors” for interactions plot for Copley ...