3 May
2011
3 May
'11
11:04 a.m.
Hi Tariq,
The time-series variable should be the variable that marks the time period
for each observation, which sounds like the year column to me. You probably
want to include a spline of time with, say, 3-5 knots in order to impute
from flexible trend lines within each site. You probably also want to
include the cross-section variable (site code) to account for mean-shifts
from site to site.
Cheers,
matt.
On Fri, Apr 29, 2011 at 5:56 PM, Tariq Abbas <tariq_uvas(a)hotmail.com> wrote:
Hi,
There are 535 sites in Pakistan where wild birds are counted by volunteers
once per year usually in the mid of winter. I have data from 1987-2007. The
data contain missing values that I want to impute through Amelia II.
I have restructured subset of data into three columns (site code, year,
count). Would you please guide me what should be the model specifications
(options) [knots, priors, and numeric options if required]? I get error
message when I set "count" as time series variable and try to impute it.
I can provide you data if required.
Regards
Tariq Abbas
Free university of Berlin
Germany