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Mplus Discussion > Growth Modeling of Longitudinal Data >
 Mario Pandelaere posted on Friday, December 02, 2016 - 12:26 pm
I'm trying to fit a growth model to consumer willingness to pay estimates for increasing amounts of a good (e.g, 1 oz, 2 oz, 3 oz, 4 oz and 5 oz). To eliminate widely varying estimates, we gave everyone the same price level for 1 oz. and had them price the remaining 4 levels.

When I fit a growth model on the 5 observations, I run into the problem that there is no variance on X1 (the estimate for 1 oz.), which was intended. Any way to circumvent the problem (besides excluding that variable)?

 Linda K. Muthen posted on Friday, December 02, 2016 - 5:29 pm
I think your only choice is to exclude the variable.
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