Why was the regression set limited to about 20 cases?

The regression set was limited to approximately 20 cases due to several reasons:

• Limited availability of data with the necessary characteristics for regression.
• The requirement for data quality and completeness, which reduced the number of suitable examples.
• The focus on the most representative and significant cases to simplify analysis and improve model accuracy.

This limitation helps to avoid overfitting and concentrate on key scenarios, but requires careful generalization of the results.