Estimating Model Coefficients...

Greetings,

In attempting to estimate model coefficients I've run into a couple
problems. The first is that I am missing some tables, tables that are not
specified in the documentation (I am using the Nov 21st 06 version). Now I
know the documentation does not yet reflect urbanism 4, so I was hoping
someone could inform me on the schema of the tables and possibly of their
data sources. The first is persons (from households?) The others are
large_areas, plan_type_groups, and plan_type_group_definitions. I assume
(maybe incorrectly?) that the tables associated with plan types carry the
same schema as the tables for development_types but am lost on large_areas.

I also am missing some fields in my travel data table, specifically
'am_single_vehicle_to_work_travel_time' and
'single_vehicle_to_work_travel_cost'. How much would it hurt to add these
fields and enter a constant value for each TAZ, say 12 minutes for
.travel_time and $2.25 for .travel_cost?

One more thing.for the model that I have had success estimating, AOCM, I
have not been successful at creating the coefficients and specification
tables. In my run_estimation.py file there is a line

estimator = Estimator(run_configuration, save_estimation_results=False)

where when I change save_estimation_results=True, an error results.

        Simulate year 1997: completed....................................6.1
sec
        Closing log file: c:/urbansim_cache/ep_pilot\year_1997_log.txt
    Starting simulation for year 1997: completed.........................6.2
sec
Start simulation run: completed..........................................6.2
sec
Traceback (most recent call last):
  File "run_estimation.py", line 49, in ?
    estimator.estimate()
  File "C:\Python24\Lib\site-packages\urbansim\estimation\estimator_new.py",
line 69, in estimate
    self.save_results(out_storage=out_storage)
  File "C:\Python24\Lib\site-packages\urbansim\estimation\estimator_new.py",
line 105, in save_results
    elif self.model_system.vardict['output_db'] is None:
KeyError: 'output_db'

Am I going about this the wrong way? i.e. is there somewhere else, besides
the estimation configuration file, where I can specify that the results be
saved to MySQL?

Thanks for your help..

Quinn Korbulic
GIS Coordinator
Spatial Applications and Research Center
New Mexico State University
Geography Department
Box 30001, Dept. MAP
Las Cruces, NM 88003-0001
VOICE (505) 646-5755
FAX (505) 646-7430
Received on Fri Feb 23 2007 - 14:36:24 PST