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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)