@article{doi:10.1080/10705511.2010.510070, author = {Evermann, Joerg}, title = {Multiple-Group Analysis Using the sem Package in the R System}, journal = {Structural Equation Modeling: A Multidisciplinary Journal}, volume = {17}, number = {4}, pages = {677-702}, year = {2010}, doi = {10.1080/10705511.2010.510070}, URL = {http://www.tandfonline.com/doi/abs/10.1080/10705511.2010.510070}, eprint = {http://www.tandfonline.com/doi/pdf/10.1080/10705511.2010.510070} }