Statnote 18: comparison of regression lines

Anthony Hilton, Richard A. Armstrong

Research output: Contribution to specialist publication or newspaperArticle


In many circumstances, it may be of interest to discover whether two or more regression lines are the same. Regression lines may differ in three properties, viz., in residual variance, in slope, and in elevation; all of which can be tested using analysis of covariance. If there are no significant differences between regression lines, an investigator may which to combine the data from different studies and fit a single regression line to the whole of the data.
Original languageEnglish
Number of pages2
Specialist publicationMicrobiologist
Publication statusPublished - Sept 2009


  • regression lines
  • residual variance
  • slope
  • elevation
  • analysis of covariance


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