“…Following Kenny and Judd (1984), several strategies to simplify the specification of the constraints have been devised, for example, by centering the indicators of the latent predictor variables or by using two-step estimation procedures (Algina & Moulder, 2001, Little, Bovaird, & Widaman, 2006, Ping, 1995, 1996. The so-called unconstrained approach (Kelava & Brandt, 2009;Marsh et al, 2004;Marsh, Wen, & Hau, 2006) represents the current end of this development: Marsh et al (2004) showed that only a single constraint is necessary when only a single interaction effect is estimated (see also Lin, Wen, Marsh, & Lin, 2010;Wen, Marsh, & Hau, 2010). Building upon this work, Kelava (2009) and Kelava and Brandt (2009) introduced the extended unconstrained approach (ExUC) and showed how the unconstrained approach can be correctly extended to simultaneously estimate latent quadratic and interDownloaded by [Universitaetsbibliothek Giessen] at 01:37 19 November 2014…”