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An Example of Pruning Technique for Outlier Detection. 2. 1. 1. Example. Using the distance based method where knn=1, the left-most point is outlier Using pruning: What is the best case? What is the worst case?. Outliers has first ordering. 2. 1. 1. 1. 2. 3. 4.

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example

2

1

1

Example
  • Using the distance based method where knn=1, the left-most point is outlier
  • Using pruning:
    • What is the best case?
    • What is the worst case?
outliers has first ordering
Outliers has first ordering

2

1

1

1

2

3

4

  • Total # comparisons = 10
outliers has last ordering
Outliers has last ordering

2

1

1

4

3

2

1

  • Total # comparisons = 12
another case
Another case

2

1

1

2

3

1

4

  • Total # comparisons = 8