a length (straight or curved) without breadth or thickness; the trace of a moving point

a visual representation of the relations between certain quantities, represented as points, plotted with reference to a set of axes

a smooth curve fitted to the set of paired data in regression analysis; for linear regression the curve is a straight line

a curve having ordinates which are a measure of the area (or quadrature) of another curve.

a visual representation of the relations between certain quantities, represented as points, plotted with reference to a set of axes