Page 274 - Solid Waste Analysis and Minimization a Systems Approach

252 SOLID WASTE CHARACTERIZATION BY BUSINESS ACTIVITIES

Thorndike Procedure Graph
800
Average SSE per Group 600
700

500
400
300
200
100
0
2 5 8 11 14 17 20 23 26 29 32 35

Number of Clusters (k)

Expanded View
25

Average SSE per Group 15 Optimal cluster size (k) = 22
20

10

5

0
13 15 17 19 21 23 25 27 29 31 33 35
Number of Clusters (k)

Figure 15.8 K-means method and Thorndike procedure graph to
determine the optimal number of clusters (k).

TABLE 15.4 ANOVA TABLE FOR THE 22 SELECTED WASTE GROUPS (CLUSTERS)

SSA DEGREES SSE DEGREES
(BETWEEN 22 OF (WITHIN 22 OF
ATTRIBUTE CLUSTERS) FREEDOM CLUSTERS) FREEDOM F STATISTIC

BIOMEAN 63.911 21 0.089 43 1463.290
BIOSTD 63.113 21 0.887 43 145.732

CDMEAN 63.817 21 0.183 43 715.906

CDSTD 63.780 21 0.220 43 593.930
FABRICMEAN 63.251 21 0.749 43 173.031

FABRICSTD 63.283 21 0.717 43 180.723
FOODMEAN 63.759 21 0.241 43 540.976

(Continued )