THE APPLICATION OF EQUATION MODELS TO DETERMINE THE AGE OF PINK RIVER DOLPHIN SKULLS - Biology, Evolution and Conservation of River Dolphins Within South America and Asia - page 94

0.3985), V37 (r = 0.5325; r 2 = 0.2835), V38 (r = 0.5197; r 2 = 0.2700), and V42 (r = 0.5847; r 2
= 0.3419). Variable 21 (V21) showed a significant relationship with age using model 7 (r =
0.5758; r 2 = 0.3315), as did V29 (r = 0.5246; r 2 = 0.2752).
Table 8. Observed and expected age estimates by means of multiple regression using
absolute value distances.

Observed
Age

Estimated
Age

Observed
Age

Estimated Age

1 31.000 28.428 37 20.000 22.134

2 44.670 38.046 38 20.000 20.323

3 15.330 18.473 39 32.330 27.850

4 16.670 18.223 40 22.000 17.985

5 19.330 20.868 41 34.670 31.994

6 14.000 11.934 42 27.670 27.613

7 36.000 30.818 43 2.0000 -.48393

8 30.000 25.542 44 18.330 17.983

9 15.000 10.431 45 17.670 14.392

10 1.0000 1.5782 46 19.000 21.181

11 23.330 22.058 47 20.330 22.732

12 6.0000 6.8494 48 .50000 -1.2580

13 17.330 24.649 49 5.0000 4.2978

14 17.330 19.082 50 40.000 40.648

15 27.000 33.746 51 42.670 41.517

16 5.0000 6.4392 52 20.670 22.744

17 37.000 35.251 53 14.000 11.629

18 1.0000 9.6655 54 1.0000 5.9686

19 4.0000 6.4875 55 2.6700 2.9932

20 21.000 26.903 56 6.0000 5.2628

21 20.330 21.555 57 .50000 1.1774

22 3.0000 1.9518 58 14.000 11.504

23 6.3300 13.319 59 .50000 -.95871

24 8.3300 7.3142 60 6.0000 5.6430

25 14.330 11.715 61 2.0000 4.6141

26 6.3300 7.1177 62 17.330 21.102

27 1.0000 -2.2043 63 37.670 36.941

28 10.000 12.592 64 12.330 12.194

29 9.6700 10.826 65 24.000 26.619

30 9.6700 10.826 66 18.000 20.924

31 32.670 32.426 67 27.330 20.690

32 6.0000 4.4641 68 .50000 -.95871

33 3.0000 4.3992 69 .50000 -.95871

34 2.0000 -3.0196 70 16.000 19.630

35 42.000 37.568 71 19.330 18.645

36 1.0000 -.72749

The polynomial regressions with the higher correlations coefficients were those using
V11 (fifth order: r = 0.5435; r 2 = 0.2954), V12 (fifth order: r = 0.5507; r 2 = 0.3033), V15
(fifth order: r = 0.6441; r 2 = 0.4148), V21 (fifth order: r = 0.6219; r 2 = 0.3868), V23 (fifth
order: r = 0.6094; r 2 = 0.3715), V26 (fifth order: r = 0.5606; r 2 = 0.3142), V27 (fifth order: r =