Minitab Help 9: Data Transformations

Minitab 18

Minitab®

Word recall (log-transforming a predictor)

Mammal gestation (log-transforming the response)

Shortleaf pine trees (log-transforming both response and predictor)

Underground air quality (interactions)

Bluegill fish (polynomial regression)

Experiment yield (polynomial regression)

Chemical odor (polynomial regression)

  • Use Calc > Calculator to create squared variables and Perform a linear regression analysis of Odor on Temp + Ratio + Height + Tempsq + Ratiosq + Heightsq.
  • Alternatively, Perform a linear regression analysis of Odor on Temp + Ratio + Height, but before clicking "OK," click "Model," select Temp, Ratio, and Height in the "Predictors" box, change "Terms through order" to "2" and click "Add." You should see "Temp* Temp," "Ratio*Ratio," and "Height*Height" appear in the box labeled "Terms in the model."
  • Perform a linear regression analysis of Odor on Temp + Ratio + Height + Tempsq + Ratiosq (remove the "Height*Height" term by clicking "Model," selecting "Height*Height" in the box labeled "Terms in the model," and clicking "X").