(g) Phi Deviation Measure (°#). A measure of one half of the spread 

 of the quartiles and is expressed in phi units to the nearest hundreth 

 with the given value computed from the formula: 



(h) Phi Skewness Measure (a^). A measure of the symmetry of the curve 

 in such a way that the departure of the mean from the median is independent 

 of the spread or deviation of the curve. It is expressed in phi units to 

 the nearest hundredth with the given value computed from the formula: 



a^ = Mj4-Md<4 

 where M/rf (mean) is equal to half the sum of the quartiles. 



137 



