Betas for orthogonal polynomial

Welcome to the forum for MLwiN users. Feel free to post your question about MLwiN software here. The Centre for Multilevel Modelling take no responsibility for the accuracy of these posts, we are unable to monitor them closely. Do go ahead and post your question and thank you in advance if you find the time to post any answers!

Remember to check out our extensive software FAQs which may answer your question: ... port-faqs/
Post Reply
Posts: 1
Joined: Mon Jun 28, 2010 7:57 am

Betas for orthogonal polynomial

Post by pdv »

Hello all,

I have six waves of election studies from which I created a long format dataset with a categorical identifyer "year". I model the effect of the year using orthogonal polynomial transformation (linear and quadratic) and interact predictors in the model with the "year" in order to get specific estimates for each time-point. However, in MLwiN I can only get estimates for the middle of my time-trend. Namely, if I have six waves from 1987 to 2007 I only get the estimates for 1997 - the year when no election was held. Of course, I can do customized predictions for other years, but then I need to have ten graphs rather than one simple table. Essentially, what I need is the beta coefficients and standard errors for all other years and I am not sure if/how to get them.
Note: Predictions window is not an option b/c my independent variables are continious so in this case I am getting an estimate for each value rather than an overall effect.

Post Reply