Concomitant Variable/Examples/Insecticide

Example of Concomitant Variable

Consider an experiment to test the effect of various insecticides at reducing a pest on fruit trees.

An appropriate concomitant variable would be a measure of the level of infestation on each experimental unit immediately before applying the insecticides.

Hence the technique of analysis of covariance adjusts for the effects of differing initial infestation on the response to the insecticides.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): analysis of covariance
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): analysis of covariance