mp&m eeba appendices appendix g extrapolation methods introduction epa estimates both cost and benefits of environmental regulations based on a random stratified sample facilities 1 then national level costs by extrapolating analytic results from to the using statistically determined facility weights used in benefit analysis are detailed questionnaire stratification means dividing population into number non overlapping sub populations strata these consist that homogeneous with respect size ie employees or revenue engineering characteristics such as wastewater flow because this information was not available at time frame developed contents raking adjust 2 ing adjustment 3 y for developing weighted sites more than one 7 study 13 e pollutant loads 14 ctivities reaches affected
