Iteration 6:   log likelihood = -3288.2861  (not concave)
numerical derivatives are approximate
nearby values are missing
numerical derivatives are approximate
nearby values are missing
Iteration 7:   log likelihood = -3287.8147  (not concave)
Iteration 8:   log likelihood = -3286.0873  
numerical derivatives are approximate
nearby values are missing
Iteration 9:   log likelihood = -3285.9439  (not concave)
numerical derivatives are approximate
nearby values are missing