Dear Statalist,
I am just new here. I tried to estimate a model with ml command, but came
up with an unknown error message. The following is the error message I
encountered. Mymodel is a ml programme I wrote.
//////////////////////////////////////////////
. ml check
Test 1: Calling ...<omitted>...
Test 2: ...<omitted>...
Searching...
...<omitted>...
------------------------------------------------------------------------------
MYmodel HAS PASSED ALL TESTS
------------------------------------------------------------------------------
Test 10: Does MYmodel2 produce unanticipated output?
...<omitted>...
-------------------------------------------------------------- begin execution
---------------------------------------------------------------- end execution
. ml search
initial: log likelihood = -149.08141
improve: log likelihood = -149.08141
rescale: log likelihood = -149.08141
rescale eq: log likelihood = -132.18515
. ml max
initial: log likelihood = -132.18515
rescale: log likelihood = -132.18515
rescale eq: log likelihood = -132.18515
Iteration 0: log likelihood = -132.18515 (not concave)
Iteration 1: log likelihood = -127.73916
Iteration 2: log likelihood = -123.22016
could not calculate numerical derivatives
missing values encountered
r(430);
////////////////////////////////////////////////
I do not understand what brought about this problem. Would someone kindly
suggest me what happened in my Stata ?
I thank you for you help.
Sincerely,
Fred Wu
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