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Thus , the explanatory slogan " ancient hatreds " of the South Slavic peoples , so often referred to in the western media , is but a rhetorical screen obscuring the modernity of conflict based on contested notions of state , nation , national identity , and sovreignity . In statistical models , the explanatory variables may be causative or simply useful estimators of the response variable ( Clarke 1994 ) ; readily measured environmental characteristics may thus serve as surrogates for hydrogeologic variables in a statistical model . Developing statistical models for water table mapping begins with conceptualizing relationships between water table depth , the response variable , and other mappable characteristics , the explanatory variables . When the revisor 's correction ill validating the renumbering is enacted , the explanatory note is removed and the reference to s. 13.93 ( 1 ) ( b ) in the history note is replaced by a reference to the act number of the correction bill . ) For even in purely practical applications , the explanatory power of a theory is paramount , and its predictive power only supplementary .