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Exercise: Vocabulary, age, and epilepsy, 2

Question 2: What is a regression line?

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Suggested answer

'Regression' is the name given to a group of procedures used to predict one variable,
called the outcome, from another variable, called the predictor.
A regression line is the graphical representation of the best prediction of the outcome variable
(vocabulary test score) from the predictor (age).

This is a straight line, because the relationship which has been imposed on the data is of the form:

vocabulary test score = intercept + slope × age.

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Last updated: 1 December, 2006.

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