doe eia m059 2003 part 2 model documentation petroleum market of the national energy modeling system b appendices thru i february oil and gas division office integrated analysis forecasting information administration nems page iii table contents section number acronyms abbreviations vii 1 introduction purpose this report summary 3 archival citation 4 organization objectives relationship to other models overview rationale theoretical approach comparison with module fundamental assumptions alternative approaches reasons for selection 11 pseudodata econometric equation linear approximation 12 abbreviated programming 13 detailed 15 structure main subroutines 8 matrix preprocessing 22