Average variance extracted


In statistics, average variance extracted is a measure of the amount of variance that is captured by a construct in relation to the amount of variance due to measurement error.

History

The average variance extracted was first proposed by Fornell & Larcker.

Calculation

The average variance extracted can be calculated as follows:
Here, is the number of items, the factor loading of item and the variance of the error of item.

Role for assessing discriminant validity

The average variance extracted has often been used to assess discriminant validity based on the following "rule of thumb": the positive square root of the AVE for each of the latent variables should be higher than the highest correlation with any other latent variable. If that is the case, discriminant validity is established at the construct level. This rule is known as Fornell–Larcker criterion. However, in simulation models this criterion did not prove reliable for composite-based structural equation models, but indeed proved to be reliable for factor-based structural equation models.

Related coefficients

Related coefficients are Cronbach's alpha and congeneric reliability which can be used to evaluate the reliability of tau-equivalent and congeneric measurement models, respectively.