Resolving IndexError When Extracting Degrees of Freedom from stats.ttest_ind Output in Python

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The Problem

Consider the following code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Output:

[[See Video to Reveal this Text or Code Snippet]]

From the output, you can see that out contains three important pieces of information:

Truth value of the t-statistic

p-value

Degrees of freedom (df)

However, when you try to extract the df using indices such as out[2] or out[-1], you encounter an error:

[[See Video to Reveal this Text or Code Snippet]]

The following attempt to unpack the output also throws an error:

[[See Video to Reveal this Text or Code Snippet]]

Why Does This Happen?

The Solution

To successfully retrieve the values from the TtestResult object, particularly the degrees of freedom, you should access the attribute directly. Here's how you can do it:

Fetching the Statistics and P-value

If you wish to extract the t-statistic and p-value first, you can easily do so:

[[See Video to Reveal this Text or Code Snippet]]

Retrieving Degrees of Freedom

To access the degrees of freedom, simply reference it like so:

[[See Video to Reveal this Text or Code Snippet]]

Complete Code Example

Here’s how the full code would look:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion