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st: Unknown error message


From   sender <[email protected]>
To   [email protected]
Subject   st: Unknown error message
Date   Mon, 20 Oct 2003 23:01:08 +0900

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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