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.

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An Example of Pruning Technique for Outlier Detection

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An example of pruning technique for outlier detection

An Example of Pruning Technique for Outlier Detection


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


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