Eigenfactor measures journal impact based on the number of times journal articles have been cited and which journals they were cited by. Citations from journals with high impact factors will have a greater influence on the score than lesser cited journals. Eigenfactor removes metrics from journal self-citation, making it more difficult for journals to artificially increase their score.
Eigenfactor is calculated in a similar manner to Journal Impact Factor but with higher impact journals being given more weight. A thorough explanation of the calculation method is provided by Eigenfactor.
Limitations of Eigenfactor