Preprocessing data is very crucial and important step in any machine learning project. For introduction to preprocessing you can read my article .
Data Preprocessing includes techniques like:
- Feature Scaling
- Handling missing value
Performing preprocessing we’ll use preprocess widget.
Create workflow for it.
Feature scaling is a scaling technique in which value are shifted and rescaled so that they end up ranging between 0&1 or maximum absolute value of each feature is scaled to unit size.
Standardization means making distribution to mean 0 & standard deviation 1.
Let’s select that option in preprocess widget.
for performing encoding in using continuize discrete variable option
for performing encoding you can use continuize disctrete variables option.
Discritization method are used to chop a continuous function into a discrete function , where the solution value are defined at each point in space and time.
In preprocess widget you there is a option called Discretize Continuous Variables.
You can achieved randomization using same preprocess widget. Just seect randomized widget and use builtin options as per your need.
Handling missing values:
I covered a lot of information in this blog about data preprocessing with orange tool.