question: private Instances makeHeader ( ) { ArrayList < Attribute > fv = new ArrayList < Attribute > ( ) ; fv . add ( new Attribute ( "Margin" ) ) ; fv . add ( new Attribute ( "Current" ) ) ; fv . add ( new Attribute ( "Cumulative" ) ) ; return new Instances ( "MarginCurve" , fv , 100 ) ; }
target:  Creates an Instances object with the attributes we will be calculating.