This approach does not work with a continuous outcome. You might instead consider two-part modeling. See Example 6.16 in the Mplus User's Guide.
Gareth posted on Saturday, January 24, 2009 - 11:33 am
I have modified example 6.16, but is the floor variable treated as a latent class in its own right (so I should ask for classes=5), or is it present throughout, in the overall model (so I should ask for classes=4).
I anticipate four latent classes (increasing, decreasing, rapidly increasing, consistently low), in addition to the "floor" variable (no use)?
Ideally, I want to compare the four growth patterns to "no use". If this is not possible, I can use the consistently low class instead, but I would like to know how the zeros are accounted for in two-part mixture growth models.
Two-part modeling does not involve a class per se. So if you hypothesize 4 classes, then classes = c(4);
Only if you also hypothesize a class of zero (floor value) throughout would you specify a zero class for the u part; but that you have to add yourself.
Gareth posted on Monday, January 26, 2009 - 3:39 pm
I hypothesize a class of zero throughout, so I have attempted to add a zero class for c#1. I am expected the other four classes to show different growth patterns, but a zero value for the first class throughout. Is this the correct syntax?