this is a working document prepared by the energy information administration eia in order to solicit advice and comment on statistical matter from american association committee statistics topic will be discussed at s spring 2006 meeting with held april 6 7 improving petroleum refinery formulation sage model john staub oiaf doe gov 202 586 6344 phillip tseng smg 287 1600 abstract united states completed initial development of system for analysis global markets early 2003 built liner programming platform solved least cost predetermined set service demands eg residential lighting light duty vehicle transportation etc are driven exogenous assumptions about population gross domestic product gdp reduce computation requirements time horizon divided into five year periods centered 2005 2010 solves each period sequentially without foresight ie does not take 2015 account when solving