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st: ice error


From   fernando andrade <fandrade.stat@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: ice error
Date   Mon, 23 Jan 2012 14:42:33 -0500

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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