Box Cox Transformation in Excel

Use Box Cox Transformation to Transform Non-Normal Data into a Normalized Form

Box Cox transformation shifts the data to a root of the data using lambda:
-1< lambda <1 (e.g., 3.01^0.5) or ln(3.01) if lambda = 0.

To use Box Cox Transformation in QI Macros Excel Add-in:

  1. Click and drag over your data to select it.

    box cox non normal data example
  2. Click on the QI Macros menu, then Statistical Tools -> Regression and Other Statistics -> Box Cox.


  3. QI Macros will prompt you for a transformation factor.

    box cox transformation factor
  4. The results will include your original data to the left, the transformation factor (lamba) and the transformed normalized data. If you change lambda, the normalized data values will change.

    box cox transformation results

If we ran a histogram on the before and after data sets we can compare the non-normal and normal distributions.

Non-normal Data

non normal data

histogram non-normal data

Normalized Data

normalized data

histogram normalized data


Why Choose QI Macros Statistical Software for Excel?

affordable

Affordable

  • Only $299 USD - less with quantity discounts
  • No annual fees
  • Free Technical Support

easy to use

Easy to Use

  • Works Right in Excel
  • Interprets Results for You
  • Accurate Results Without Worry

proven and trusted

Proven and Trusted

  • 100,000 Users in 80 Countries
  • Celebrating 20th Anniversary
  • Five Star CNET Rating - Virus Free