FREQUENCY DISTRIBUTION OF A BEHAVIOR 
THROUGH THE POPULATION 
Figure 77. — The frequency distribution of a behavoir through the population. This behavior is the proneness of rats to enter 
traps. A rat with an index of zero always avoids traps. A rat with an index near two entered a trap at nearly every 
exposure. 
Table 10 . — Comparative data on recapture intervals 
Sex 
Period born 
Number of in- 
dividuals 
Mean interval 
between cap- 
tures in days 
it 2 (j 
cf 
1947 
31 
88. 58 
26. 90 
9 
1947 
45 
98. 66 
24. 66 
<? 
March-May 1948 
167 
57. 70 
18. 46 
9 
March-May 1948 
96 
66. 44 
20. 00 
cf 
June— October 1948 
91 
63. 00 
17. 40 
9 
June-October 1948 
57 
68. 00 
18. 40 
Total 
487 
67. 37 
20. 34 
Total exposure intervals 
893 
46. 42 
14. 48 
91 
