STATISTICAL INQUIEY 1007 



Sick population = 39'83. 

 Number of days = 366. 

 Number of admissions = 447. 

 39-83 X 366-^447 = 32-61 days, 



■which is the average duration of each ease, and represents 

 the number of days' service lost by each of the sick. 



Average Inefficiency per Head.— Though, in the case we 

 have supposed, 74-84 horses out of every hundred were 

 sick during the year, and the average number of days each 

 was under treatment was over 32, yet it is interesting to 

 ascertain what the average inefficiency for each animal 

 amounted to in consequence. The rule is to multiply the 

 sick population by the number of days in the year under 

 review, and divide by the average strength -. 



Sick population=39-83 ; 



Number of days = 366 ; 



Average strength = 597-25 ; 



39-83 X 366 = 14,577-78^597-25=: 24-4 days— 



viz., the amount of sickness for the year was such as to be 

 equivalent to the loss of 24-4 days service for each horse in 

 the stud. With the above data, it is a simple matter to 

 ascertain the money loss in consequence of sickness, when 

 the cost of keep and attendance is known. 



Expression of Statistical Results. — Statistical results may 

 be expressed in a graphic manner by intersecting horizontal 

 and vertical lines. The horizontal lines are known as the 

 axis of the abscissse, the vertical as the axis of the ordinates. 

 For example, in Fig. 188, p. 557, the axis of the abscissae 

 represent the number of events, while the axis of the 

 ordinates represent a certain time ; when these two quan- 

 tities are connected by lines with others of the series, a 

 curve is obtained which forms a graphic representation of 

 their relationship, and appeals more readily to the mind 

 than rows of figures. 



A system of columns may also be employed, of which 

 Fig. 218, p. 963, is an example. 



The most important points which require to be dealt with 

 in veterinary statistics are : 



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