Calculating the correlation between testability formulas

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After calculating the testability using three different methods, which are explained in the following articles:
“The Effect of Testability on Fault Proneness: A Case Study of the Apache HTTP Server”
“An Ensemble Meta-Estimator to Predict Source Code Testability,”
“Testing Object-Oriented Software: Life Cycle Solutions”

There are several relationships to calculate testability, and using different testability relationships for refactoring purposes introduces a subtle approach to increasing software quality. That’s why we calculate the correlation between these methods.