Ekman, Claes2011-02-222011-02-221994-10-010349-8034http://hdl.handle.net/2077/24601The need of a measure of rotatability is discussed and exemplified through some examples. The examples also shows the difficulties with measuring rotatability. A graphical technique for exploring the variance function is discussed.16engMeasure of RotatabilityGraphical ApproachText