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...4,60,64,71,73,75,81,82,83,86,94,95) Iteration: 500, Log-Lik: -131933.514, Max-Change: 0.00033 EM cycles terminated after 500 iterations. ERROR: The following items had negative slope parameters. 87,89,91,93,95,99ERROR: The following items had negative slope parameters (87,89,91,93,95,99). Error in probgrm(theta, DISC[i], CB[i, ]) : slope is missing or negative Does anlyone knows what the poblem might be? Any help is appreciated! Best regards Caroline [[alternative HTML version deleted]]