Lesson 17

R-Squared Form of the F Statistic

Big question

When can R-squared compute an F statistic?

Lesson progress

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Big question
Concept
Activity
Quiz

Learning objectives

  • Explain r-squared form of the f statistic in plain language.
  • Use reparameterization correctly in an interpretation.
  • Connect the lesson idea to a formula, graph, Python result, or real example.

Simple explanation

For exclusion restrictions with the same dependent variable and sample, R-squared values can replace SSR values.

Key terms

reparameterization
A model rewrite that makes a restriction or parameter combination appear directly.
numerator degrees of freedom
The number of restrictions being tested in an F test.
practical significance
Whether an estimated effect is large enough to matter in context.

Core formula

F=[(R2ur−R2r)/q]/[(1−R2ur)/(n−k−1)]F = [(R2_ur - R2_r) / q] / [(1 - R2_ur) / (n - k - 1)]

Use plain-language interpretation before algebra.

Example

BWGHT gives students a real-data setting for r-squared form of the f statistic. The lesson emphasizes inference mechanics and interpretation, not memorized output.

Interactive visual

RSquaredFStatisticCalculator

Original Module 4 visual for R-Squared Form of the F Statistic.

wage_sample.csv

y variable

wage

The dependent variable. It is the outcome students want to explain.

x variable

education

The explanatory variable. It is used to describe changes in wage.

Live Python

R-Squared Form of the F Statistic Python example

R-Squared Form of the F Statistic Python example

Stdout

Run Python to see results here.

Status / stderr

Ready to run Python in your browser.

Line-by-line guide

  1. Line 1Load a Python library needed for data work or regression.
  2. Line 2Load a Python library needed for data work or regression.
  3. Line 3Load a Python library needed for data work or regression.
  4. Line 5Load the dataset into a pandas DataFrame.
  5. Line 6Create or update a Python object used in the analysis.
  6. Line 7Add an intercept column to the regression design matrix.
  7. Line 8Add an intercept column to the regression design matrix.
  8. Line 9Create or update a Python object used in the analysis.
  9. Line 10Create or update a Python object used in the analysis.
  10. Line 11Create or update a Python object used in the analysis.
  11. Line 12Display a result so students can inspect the output.
  12. Line 13Create or update a Python object used in the analysis.

Python walkthrough

  1. 1Load the real dataset and keep the variables needed for both models.
  2. 2Estimate unrestricted and restricted models or use statsmodels f_test.
  3. 3Compute or read the F statistic and p-value.
  4. 4Interpret the test as a joint statement about population parameters.

Live notebook

Run this lesson as a notebook

Open an editable notebook cell-by-cell, run Python in the browser, and download the `.ipynb` file for later.

Open live notebookDownload .ipynbDownload .py

Related dataset

BWGHT

Estimated time

25 to 40 min

Packages

pandas, numpy

Expected output

Printed Python results that can be compared with the lesson explanation.

Learning goals

  • Load and inspect BWGHT.
  • Run the Python cells connected to R-Squared Form of the F Statistic.
  • Interpret the output using R-squared and F statistic.

Common errors

  • File not found: check that BWGHT.DTA is installed or use the course data folder.
  • Package import error: use the browser notebook first, then download for local Jupyter if your local packages differ.
  • Column name error: compare your variable names with the dataset variables listed for this notebook.

Dataset path helper

import pandas as pd

df = pd.read_stata("/data/BWGHT.DTA")
df.head()

Interactive activity

RSquaredFStatisticCalculator

Compute R-squared form F

Use restricted and unrestricted R-squared values only when the shortcut is valid.

BWGHT

Inputs

Try it yourself

Write one plain-English sentence explaining the main idea from this lesson.

Common mistakes

Check these before you move on.

Return to the lesson assumptions, units, diagnostics, and source evidence to replace this shortcut with a defensible interpretation.

Quick quiz

What is the safest inference focus in R-Squared Form of the F Statistic?

Quick quiz

Which reporting habit is most important in R-Squared Form of the F Statistic?

Quick quiz

Why is SLEEP75 a reasonable practice dataset here?

Key takeaway

R-Squared Form of the F Statistic turns regression output into evidence only when the hypothesis, assumptions, and magnitude are stated clearly.

Download dataDownload resultsDownload interpretation