Re: st: ice error

[fernando andrade <fandrade.stat@gmail.com>]

Dear Antonis,
I apologize, i am not a frequent user in stata list, i did not know i
needed to explain where the ado comes from.
thank you very much for your suggestions,  i also thought of the
stepwise initially but then I thought that ice would take care of the
logic in the selection process. It seems it does not.
Now i am running without the sptewise and no problems so far.
best regards,
Fernando

On Tue, Jan 24, 2012 at 5:05 AM, A Loumiotis
<antonis.loumiotis@gmail.com> wrote:
> Dear Fernando,
>
> -ice- (SJ 9-3) is a user written program.  Please remember that you
> are asked to explain where user written programs come from.
>
> My guess is that the error is caused because of the stepwise option.
> You may try to run -ice- without it.  Alternatively, you may also need
> to specify option swopts(group(group_list)) where the group_list
> includes your ordered categorical variables (you might need to specify
> them using an i. prefix instead of an o. prefix).  Also make sure that
> none of the variables that nbreg will be used are included in the
> mainvarlist with an o. prefix.  These are my guesses about what
> perhaps is going wrong.
>
> Best regards,
> Antonis
>
> On Mon, Jan 23, 2012 at 9:42 PM, fernando andrade
> <fandrade.stat@gmail.com> wrote:
>>
>> Dear all
>> i am using ICE to perform multiple imputation in a large set of
>> variables, while i am running the dry run i found myself with a
>> problem i do not expected.
>> ice is giving me this error message for several ordinal variables that
>> were speficied with the o.varname option:
>>
>> Error! _Iy1rel5_w2_2 found on both sides of prediction equation
>> Error! _Iy1rel5_w2_3 found on both sides of prediction equation
>> Error! _Iy1rel5_w2_4 found on both sides of prediction equation
>> Error! _Iy1rel5_w2_5 found on both sides of prediction equation
>>
>> in this case the variable is y1rel5_w2 and the ice command i am using is
>>
>> ice a1alc8a_m   debt_w2 y1cig   y  ...  ///
>> m.y1duom5c_w2 m.y1duom5d_w2 ...  m.t1050 ///
>> o.y1sc101  o.y1rel5_w2 ....     o.y1pp1k_w2     ///
>> y1nei5  ....    t1517 ///
>> conditional(a1htv1 : flagadult==1 \ a1htv2 : flagadult==1 ...
>> \       T1016as116 : flagactua ==1 ) ///
>> cmd(a1pm15a  ...  y1alc16b_w2: nbreg) ///
>> seed(123) ///
>> stepwise ///
>> m(10) ///
>> dryrun
>>
>> note: "..." in the command mean that i omitted var names and other to
>> make the command easy reading
>>
>> I understand that ICE is generating dummies for  each variable
>> specified as o.varname or m.varname, (as in the case of o.y1rel5_w2)
>> and uses this dummies as predictors, but ice should not try to
>> directly impute the set of dummies that generates based on the
>> o.varname specification, right?
>>
>> I appreciate if you could give some ideas as why i get these errors
>>
>> thank you
>>
>> Fernando
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>
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