5 Mar
2007
5 Mar
'07
12:56 p.m.
Dear all,
I'm running version 1.1-20 of Amelia on a Windows system. In trying
to help a student add a range prior for an entire variable using
AmeliaView, I clicked on "Set observation priors"; then "add range
prior"; and in the "add prior" dialogue box that pops up, selected as
"case" the whole variable, selected the appropriate variable, set the
minimum and maximum, entered an appropriate confidence coefficient,
and then clicked "OK". In the "Observational Priors" window,
what's
now listed is a whole variable prior with a mean equal to the maximum
value that I fed to the range prior. This doesn't seem right. I'm
wondering either if I'm missing something or if this is just a display
issue. I haven't yet tried to multiply impute this data set in R
itself (and hence to build the desired prior matrix).
Any thoughts would be much appreciated.
Heather Stoll
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Amelia mailing list served by Harvard-MIT Data Center
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12 Mar
12 Mar
5:37 p.m.
Hello Heather,
Sorry for the late response, but I wanted to let you know that we've fixed
the error in Amelia you described where the mean of the prior would be set
to the maximum in the range. You can update your copy of Amelia by running
the following line of code in R:
install.packages("Amelia", repos="http://gking.harvard.edu")
Also, I wonder if you could see if this solves your other error message
about the leading minor not being positive definite. If it doesn't, please
send us another message with a bit more detail about your data and the
conditions of the error message.
thanks for helping us out,
matt.
On Mon, 5 Mar 2007, Heather Stoll wrote:
Dear all,
I'm running version 1.1-20 of Amelia on a Windows system. In trying to help
a student add a range prior for an entire variable using AmeliaView, I
clicked on "Set observation priors"; then "add range prior"; and in
the "add
prior" dialogue box that pops up, selected as "case" the whole variable,
selected the appropriate variable, set the minimum and maximum, entered an
appropriate confidence coefficient, and then clicked "OK". In the
"Observational Priors" window, what's now listed is a whole variable prior
with a mean equal to the maximum value that I fed to the range prior. This
doesn't seem right. I'm wondering either if I'm missing something or if
this
is just a display issue. I haven't yet tried to multiply impute this data
set in R itself (and hence to build the desired prior matrix).
Any thoughts would be much appreciated.
Heather Stoll
-
Amelia mailing list served by Harvard-MIT Data Center
[Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia
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Amelia mailing list served by Harvard-MIT Data Center
[Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia
13 Mar
13 Mar
12:55 a.m.
Matthew,
Thank you for updating the software so quickly. I emailed before that
I had the same problem as Heather. I just ran my imputations with
range priors set and received the following error in the output window
after the 4th imputation (of 5):
There was an unexpected error in the execution of Amelia.
Double check all inputs for errors and take note of the error message:
Error in chol(copy.theta[c(FALSE, m[ss, ]), c(FALSE, m[ss, ])]) :
the leading minor of order 28 is not positive definite
This is the same error I received before except the order number given
is not always the same (I tried several different variations).
Repeating the imputations with a ridge prior results in the same error
following the iterations of imputation 2:
There was an unexpected error in the execution of Amelia.
Double check all inputs for errors and take note of the error message:
Error in chol(copy.theta[c(FALSE, m[ss, ]), c(FALSE, m[ss, ])]) :
the leading minor of order 22 is not positive definite
The variables for which I set range priors are continuous and ordinal,
though I am considering the ordinal variables to be continuous. One
ranges from -2.5 to 2.5 and only has 15 of 208 cases missing, and the
others from 0 to 2 with a bit more missing cases (about 60 each).
Let me know if you need more details.
Thank you,
Erin Saunders
Portland State University
On 3/12/07, Matthew Blackwell <blackwel(a)fas.harvard.edu> wrote:
Hello Heather,
Sorry for the late response, but I wanted to let you know that we've fixed
the error in Amelia you described where the mean of the prior would be set
to the maximum in the range. You can update your copy of Amelia by running
the following line of code in R:
install.packages("Amelia", repos="http://gking.harvard.edu")
Also, I wonder if you could see if this solves your other error message
about the leading minor not being positive definite. If it doesn't, please
send us another message with a bit more detail about your data and the
conditions of the error message.
thanks for helping us out,
matt.
On Mon, 5 Mar 2007, Heather Stoll wrote:
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Amelia mailing list served by Harvard-MIT Data Center
[Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia
Dear all,
I'm running version 1.1-20 of Amelia on a Windows system. In trying to help
a student add a range prior for an entire variable using AmeliaView, I
clicked on "Set observation priors"; then "add range prior"; and in
the "add
prior" dialogue box that pops up, selected as "case" the whole variable,
selected the appropriate variable, set the minimum and maximum, entered an
appropriate confidence coefficient, and then clicked "OK". In the
"Observational Priors" window, what's now listed is a whole variable
prior
with a mean equal to the maximum value that I fed to the range prior. This
doesn't seem right. I'm wondering either if I'm missing something or if
this
is just a display issue. I haven't yet tried to multiply impute this data
set in R itself (and hence to build the desired prior matrix).
Any thoughts would be much appreciated.
Heather Stoll
-
Amelia mailing list served by Harvard-MIT Data Center
[Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia
-
Amelia mailing list served by Harvard-MIT Data Center
[Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia
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participants (3)
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Matthew Blackwell