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Transformations: Logged variables

Learning Outcomes

On watching this video, students should be able to:

  1. Explain what a non-linear transformation is and identify the log transformation as a type of non-linear transformation. 
  2. Explain what can be achieved with a log transformation and identify situations when it may be useful.
  3. Interpret each unit difference on the log scale as a multiplicative difference on the anti-logged (back transformed) scale
  4. Interpret the mean and mean difference calculated from log transformed data after they have been back transformed to the original scale