yingchun ji posted on Monday, December 04, 2006 - 8:26 pm
model: attd by infertw wrcontr vasm; ster by ster1-ster54@1; ster@0; ster on attd; *** ERROR One or more variables have a variance of zero.
Ster is the latent variable of outcome event. Ster1-ster54 are 54 months indicators of the event. It is very common that in a specific time interval, no event occurs to anyone. Then this produces a zero variance variable. Anyone knows how to fix it? Thank you so much!