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Table 2 Estimated timing of the point of emigration in days since fledging calculated by 12 methods (Table 1 )

From: When do young birds disperse? Tests from studies of golden eagles in Scotland

Method

Median (Range)

Bias

Mean deviation

1

First day beyond 2.9 km

42 (22–119)

−90

109

2

First day beyond 5.8 km

69 (40–208)

−56

77

3

First day beyond 20 km

103 (52–267)

−4

44

4

First day beyond 2.9 km for 2 consecutive locations

68 (40–163)

−64

82

5

First day beyond 5.8 km for 2 consecutive locations

87 (45–234)

−18

35

6

First day when all subsequent locations are over the mean distance to the nest.

283 (88–365)

134

172

7

First day beyond 9 km and not within 6 km for the following 10 days

145 (45–251)

7

12

8

Highest coefficient of variation over a 3 record period

67 (24–239)

−47

68

9

Highest coefficient of variation over a 5 record period

68 (14–240)

−43

78

10

Highest coefficient of variation over a 10 record period

69 (14–243)

−53

86

11

Highest coefficient of variation over a 30 day period

66 (14–236)

−56

88

12

Maximum change in proportion of locations inside natal home range (−30 days: +30 days )

144 (39–250)