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Discrete-time model with zero varianc... |
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yingchun ji posted on Monday, December 04, 2006 - 8:26 pm
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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! |
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I think you want to collapse time intervals so that you have some events in each. |
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