27 Sep
2012
27 Sep
'12
7:34 a.m.
Dear all
I have to impute three variables that have to verify that are all between 0
and 1 and that the sum of the three adds up to 1. Do you have an idea of
how I could introduce the latter restriction in AmeliaView?
Thanks a million in advance!
Laura Mayoral
On Fri, Sep 7, 2012 at 4:46 PM, Gary King <king(a)harvard.edu> wrote:
you can do a multivariate transformation. e.g., if
you have X, Y as your
variables, you could do a=X+Y and b=X-Y. then if you know b > 0, you could
enter into amelia say B=ln(b) and then no matter what value Amelia imputes
for B, you'd be ok
Gary
--
*Gary King* - Albert J. Weatherhead III University Professor - Director, IQSS
<http://iq.harvard.edu/>- Harvard University
GKing.Harvard.edu <http://gking.harvard.edu/> - King(a)Harvard.edu -
@kinggary <http://twitter.com/kinggary> - 617-500-7570 - Asst 495-9271 -
Fax 812-8581
On Thu, Sep 6, 2012 at 6:27 PM, Patrick Lam <plam(a)fas.harvard.edu> wrote:
Is there a way to bound variables via
relationships with other variables
in the dataset when multiply imputing with Amelia? For example, if we have
a household income variable and a household savings variable (both with
some missingness) in our dataset, is there a way to specify that savings
must be less than income for each observation in the imputed datasets?
Priors and logical bounds currently in Amelia don't seem like they are set
up to do this exactly.
Thanks!
--
Patrick Lam
Department of Government and Institute for Quantitative Social Science,
Harvard University
http://www.people.fas.harvard.edu/~plam
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