GTAL - What does GTAL stand for? The Free Dictionary
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The risk variables were computed using (1) a dummy variable reflecting whether or not chemical contamination of large public wells within county j exceeded an action level (GTAL.sub.j); (2) a dummy variable reflecting whether or not specific chemicals were found in the groundwater (VOC.sub.j, DBCP.sub.j) in county j; and (3) the percentage of the population in county j that used public supplies for drinking water (PPOP.sub.j).
[RISKDBCP.sub.j] = [(GTAL.sub.j)][(DBCP.sub.j)][(PPOP.sub.j)]
[RISKVOC.sub.j] = [(GTAL.sub.j)][(VOC.sub.j)][(PPOP.sub.j)]