Statistics and Probability Dictionary

Select a term from the dropdown text box. The online statistics glossary will display a definition, plus links to other related web pages.

Select term:       

Paired Data

Two data sets are "paired" when the following one-to-one relationship exists between values in the two data sets.

  • Each data set has the same number of data points.
  • Each data point in one data set is related to one, and only one, data point in the other data set.

An example of paired data would be a before-after drug test. The researcher might record the blood pressure of each subject in the study, before and after a drug is administered. These measurements would be paired data, since each "before" measure is related only to the "after" measure from the same subject.

Use a matched-pairs t-test to see if there is a significant difference in means from paired data.

See also:   Hypothesis Test for the Difference Between Paired Means