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
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