
the results: 
(1) Samples taken earliest in the year give the most 
accurate basis for mortality-rate calculations. 
(2) Samples taken after the operation of the fluctuating 
factor fail entirely to demonstrate its presence. 
(0) The time-specific method satisfactorily duplicates the 
overall mortality rate when it is used on the early-season sample but 
it tends to exaggerate the fluctuation when it is used on the hunting- 
season sample; the dynamic method gives only an approximation of the 
fluctuation in both situations. 
Table 13.~—Derivation of Overall Mortality Rate When One Factor 
is Fluctuating 
This a comparison of dynamic and time-specific methods in analyses 
of a theoretical population with a fluctuation in the mortality 
rate and the sampling segregated according to different mortality 

factors. 
Age Intervals in Years Oml .1- - - - - 
THEORETICAL POPULATION 
Number alive at start 1000 266 101 38 15 6 2 
S% dead (disease, etc.) 50 13 5 2 1 0.3 O.1 
Alive start of hun nging 950 253 96 36 1h 5l/ 2 
65% then 50% shot© 618 126 , 48 18 7 3, 1 
Alive end of hunting season 332 1261/ 8 18 7 32/ 1 
20% then lost (disease, etc.) 66 25 10 hy 1 4 0.2 
Surviving end of year 266 101 38 1sl/ 6 2 1 
Total dead in year. 734 165 63 2h 9 3 1. 
OVERALL MORTALITY RATE 73-4 62 62 62 62.1 62.1 61.9 
MORTALITY RATES CALCULATED FOR COMPOSITE LIFE TABLES BASED ON SAMPLES 
Initial disease sample 
Dynamic method 70.0 62.2 62.5 63.3 65.8 73.7 100 
Time-specific method 73.4 62.0 62.0 62.0 61.7 64.3 100 
Hunting sample only 
Dynamic method 75.2 62.2 62.5 63.3 65.7 72.5 100 
Time-specific method 79.5 62.0 62.0 62.0 62.1 62.0 100 
Subsequent disease, etc. 
Dynamic method 62.1 62.2 62.5 63.3 65.6 72.6 100 
Time-specific method 62.0 62.0 62.0 61.9 61.9 62.3 100 
1/ the entire table was Computed to to 2 decimal places; rounding off the 
~ mumbers has left slight discrepancies, which are apparent in the final 
results. 
2/ 65 per cent of those alive at the start of the hunting season are shot 
in age interval 0-1; in subsequent years, 50 per cent are shot 

ho 
