feature/econometrics: Added Variance Inflation Factor

[HemuManju]

Description

Hello Everyone,

I hope this message finds you well.

In this pull request, I have included the following models for econometrics:

• Variance Inflation Factor (VIF)

How has this been tested?

• I have followed the test structure, like the technical analysis (ta) extension.
• All the tests (API and Python) are included in the integration folder.

• Make sure affected commands still run in terminal
• Ensure the SDK still works
• Check any related reports

Checklist:

• I have adhered to the GitFlow naming convention, and my branch name is in the format of feature/feature-name or hotfix/hotfix-name.
• Update our documentation following these guidelines. Update any user guides that are affected by the changes.
• Update our tests following these guidelines.
• Make sure you are following our CONTRIBUTING guidelines.
• If a feature was added, make sure to add it to the corresponding integration test script.

Others

• I have performed a self-review of my own code.
• I have commented on my code, particularly in hard-to-understand areas.

⚠️ Disclaimer: This is a rewrite of the original openbb_terminal feature in v4 SDK. Credit goes to its original authors.

[jmaslek]

This actually results in the dataframe cell having the text "VIF Values:" Would be beneficial to be able to use the returned value without having to process it.

[jmaslek]

Thanks for bringing this one over! I left a comment in the code, but it would be nice to be able to associate a variable with the vif in the output, so returning the column as well in the df would be my initial thoughts...

[HemuManju]

@jmaslek If I understand correctly, the output should be something similar to f{column_name}_vif_value instead of just returning a list of vif values?

[jmaslek]

I think we can return a dataframe where the columns are the columns of the input and the values are the corresponding big value.

[HemuManju]

Now the result is a dataframe with columns from input and values are VIF values. Also changed the implementation slightly to improve readability.

[jmaslek]

Sorry for the delay but this looks good o my end!