# An Example of Pruning Technique for Outlier Detection - PowerPoint PPT Presentation

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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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An Example of Pruning Technique for Outlier Detection

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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

• Total # comparisons = 10

### Outliers has last ordering

2

1

1

4

3

2

1

• Total # comparisons = 12

### Another case

2

1

1

2

3

1

4

• Total # comparisons = 8