The Optimized Anomaly Detection Models Based on an Approach of Dealing with Imbalanced Dataset for Credit Card Fraud Detection

Algorithm 3

PathLength [5]

Input: : an instance, : an iTREE, : current path length;

to be initialized to zero when first called

Output: path length of

1: if is an external node then

2:  return { is defined in Equation (1)}

3: end if

4: 

5: ifthen

6:  return

7: else

8:  return

9: end if