the social accounting matrix for the SAGE model relies on the proprietary
state-level IMPLAN data set available from http://www.implan.com. therefore, the
benchmark data for the model is not included in this repository. to build the
model's dataset:

1.) using the implan software create an implan model for each state and the
    district of columbia from the implan software. the spreadsheet in
    build/data/implan/batch state models.xls will allow for the batch creation
    of the models to avoid creating them one by one

2.) from the implan software open up each state model and run "Social Accounts->
    IxC Social Accounting Matrix->Detail SAM->Export->Gams Single File" to
    export the data into a file readable by GAMS. the files should be named as
    XX.gms and placed in build/data/implan, where XX is the state abbreviation

3.) the model's dataset may then be created by running the R script
    build/build_default_datasets.R which will create the missing
    data/default_aggregation.gdx

4.) to create the alternative version of the dataset for the national
    aggregation of the model change change the aggretaion file at the top of
    build/build_default_datasets.R to national_aggregation.gms and re-run the
    build script
