Re: [UrbanSim-Users] land price estimation and RPy

Brian,

You can see the list at
http://www.urbansim.org/docs/installation/python_packages.html.

Sqlalchemy is the only new requirement beyond version 857. You need to
install the beta version 0.4 of sqlalchemy. It is at
http://www.sqlalchemy.org/download.html.

Cheers,
Travis

Brian Miles wrote:
> Hi Hana,
>
> We're currently running version 857 of Opus (from the zip file). I
> pulled down the latest from SVN, but it appears that I am missing at
> least one library that the latest version expects:
>
> File "C:\opusworkspace-svn\opus_core\database_management
> \database_server.py",
> line 17, in ?
> from sqlalchemy.schema import MetaData
> ImportError: No module named sqlalchemy.schema
>
> Do you have a document that lists all of the libraries required by
> the latest version of Opus?
>
> Thanks,
>
> Brian
>
> On Oct 3, 2007, at 4:50 PM, Hana Sevcikova wrote:
>
>> Brian,
>>
>> You're right, changing the estimation procedure is not very well
>> supported. I have done some changes today, so please update from
>> SVN. Then you can add an argument
>>
>> estimation_procedure = "opus_core.estimate_linear_regression_r"
>>
>> to the land_price_model controller in urbansim/configs/
>> general_configuration.py (in the LandPriceModelConfigurationCreator
>> call) and the estimation should call that module.
>>
>> We haven't kept code that uses rpy up to date since our conversion
>> to numpy, so yes, the module will be probably broken. But the
>> suggested change should do what I understand you want to do.
>>
>> Let me know if you need this also for other models. We are in the
>> process of changing the system of configurations, so in the future
>> it should be much easier to specify these non-standard settings.
>> Sorry for the inconvenience.
>>
>> Hana
>>
>>
>> Brian Miles wrote:
>>> Hello,
>>> We are trying to configure the land price model to estimate using
>>> RPy so that we can use R's AIC and plotting features.
>>> I see from urbansim.models.LandPriceModel.estimate() that the
>>> default estimation procedure used is that defined in
>>> opus_core.estimate_linear_regression. I see that there exists
>>> another potential land price estimation procedure in
>>> opus_core.estimate_linear_regression_r. In theory, we would use
>>> an estimation procedure something like this one to take advantage
>>> of R's AIC calculation and plot generation.
>>> However, I don't understand how to configure the
>>> urbansim.models.LandPriceModel to use something other than the
>>> default estimation procedure. Taking my cue from the
>>> documentation in opus_core.RegressionModel.estimate(), I tried
>>> adding the key 'estimation' with the value
>>> 'opus_core.estimate_linear_regression_r' to my estimation config.
>>> This doesn't work however, because LandPriceModel (a subclass of
>>> RegressionModel) specifies a procedure, and the logic in
>>> RegressionModel.estimate() only looks to the estimation
>>> configuration for the estimation procedure if there is no estimate
>>> procedure specified.
>>> I temporarily--for testing purposes--modified
>>> RegressionModel.estimate() to look first to the config. However
>>> the things I'm setting in my estimation config (e.g. estimation,
>>> cache_directory) aren't in the estimation config that
>>> RegressionModel.estimate() is seeing.
>>> I'm unsure of what the best way is to do what I'm trying to do
>>> (specify an estimation procedure other than that which is hard
>>> coded in LandPriceModel.estimate()).
>>> I may not be properly specifying the estimation procedure that I
>>> have to run; how should this be done? (I didn't see any specific
>>> advise on this in the Opus user guide.) Or perhaps I should copy
>>> the LandPriceModel into a models directory within my own package
>>> and modify that? (note: I modified urbansim.models.LandPriceModel,
>>> as a test, to run opus_core.estimate_linear_regression_r, and it
>>> did, only this estimation procedure appears to be broken.
>>> However, this is a moot point until I have an acceptable/"correct"
>>> way of specifying estimation procedures to models).
>>> Whether one of these or something else, what's the best way to
>>> proceed?
>>> Thanks,
>>> Brian Miles
>>> Graduate Assistant
>>> Spatial Analysis Lab - Rubenstein School of Environment and
>>> Natural Resources
>>> University of Vermont
>>> ---------------------------------------------------------------------
>>> ---
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>
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Received on Thu Oct 04 2007 - 10:39:14 PDT