ChiMerge: Discretization of Numeric Attributes

Python implementation of ChiMerge, a bottom-up discretization method based on ChiSqrt test.

• Reference paper: https://www.aaai.org/Papers/AAAI/1992/AAAI92-019.pdf

1. Database: IRIS, Attribute: 1 (Sepal Width)

   • Intervals : [ 2. 2.5 3. 3.4]
   • Chi2: [0-1) : 4.7, [1-2): 17.1, [2-3): 24.2
   • Interval-Class Frequencies (4x3)
   • [[ 1. 9. 1.] [ 1. 25. 20.] [ 18. 15. 24.] [ 30. 1. 5.]]

2. Database: TOI Example

   • Intervals : [ 1 11 45]
   • Chi2 : [0-1): 2.7, [1-2): 3.9
   • Interval-Class Frequencies (3x2)
   • [[ 4. 1.] [ 1. 3.] [ 3. 0.]]