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) |  |  |