Matt M posted on Friday, March 20, 2015 - 11:41 am
I'm in the process of constructing a multilevel model regression model. I've assessed the individual level data in SPSS. A quadratic regression at level one accounts for more variance than linear regression. However the data is clustered (as evidenced by large ICC, and, >2 design effect). Therefore I'd like to test a multilevel quadratic relationship in Mplus.
It seems like a simple issue, but I'm not finding anything online or in the forum regarding defining quadratic relationships in Mplus. Any suggestions?
Hello. We’ve been using the syntax provided in Example 9.16 in the Mplus 7 manual in order to estimate a two level longitudinal model with data clustered within person. We are interested in adding a quadratic term to the script, but were unsure how to do so. Is there a way to do so using the 9.16 syntax? If not, do you recommend using a different Example from the manual? Thank you in advance for your assistance with this.
Thank you, Bengt. In our script, we'd previously specified IDVARIABLE = person when converting our data file from wide to long. We then specified Cluster = person. This seemed to work fine until we tried to add the quadratic term. Is there a different approach that you suggest for specifying the cluster variable now?