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(( 21 * Sum( ROC( CLOSE ,1 ,% ) * ROC( Security("WIG",C),1 ,% ) ,21 ) ) -
( Sum( ROC( CLOSE ,1 ,% ) ,21) * Sum( ROC( Security("WIG",C) ,1 ,% ) ,21 ) ) ) /
( (21 * Sum( Pwr( ROC( Security("WIG",C) ,1 ,% ) ,2 ) ,21 )) -
Pwr( Sum( ROC( Security("WIG",C) ,1 ,% ) ,21 ) ,2 ))