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Re: st: ice error
fernando andrade <firstname.lastname@example.org>
Re: st: ice error
Tue, 24 Jan 2012 09:51:56 -0500
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.
On Tue, Jan 24, 2012 at 5:05 AM, A Loumiotis
> 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,
> On Mon, Jan 23, 2012 at 9:42 PM, fernando andrade
> <email@example.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) ///
>> 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
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