Refer to the exhibit.
You are using K-means clustering to classify customer behavior for a large retailer. You need to
determine the optimum number of customer groups. You plot the within-sum-of-squares (wss)
data as shown in the exhibit. How many customer groups should you specify?
A.
2
B.
3
C.
4
D.
8
This answer is strange. When k + 1 clusters do not greatly reduce the value of WSS from the
case with only k clusters, there may be little benefit to adding another cluster. In my opinion, the correct answer should be A, but C can also be considered right depending on you classify “great reduction”.
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the answer is B,3
Cause from 3, the WSS reduce is not so prominent
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