Table 2 Results of pairwise comparisons of GPS and altimeter flight heights (m), excluding floating or stationary bouts, from Generalised Linear Mixed Model with gamma distribution. Comparisons were examined in relation to sampling rate (five minutes and 10Â s), colony (Isle of May and Havergate), and Year (2019 and 2020)
Method | Rate | Colony | Year | Estimate | SE | z-ratio | P-value |
|---|---|---|---|---|---|---|---|
Altimeter | Five Min ~ Ten Sec | Combined | Combined | − 7.65–06 | 6.01–07 | − 12.71 | 0.00 |
GPS | Five Min ~ Ten Sec | 1.90–06 | 6.56–07 | 2.89 | 0.02 | ||
Altimeter ~ GPS | Five Minutes | − 1.36–06 | 7.32–07 | − 1.86 | 0.25 | ||
Ten Seconds | − 1.09–05 | 3.51–07 | − 31.03 | 0.00 | |||
Five Minutes | Havergate | 2019 | − 4.38–06 | 1.54–06 | − 2.84 | 0.25 | |
2020 | 7.23–06 | 2.53–06 | 2.86 | 0.24 | |||
Isle of May | 2019 | − 1.86–06 | 9.22–07 | − 2.02 | 0.82 | ||
2020 | 2.95–06 | 2.78–06 | 1.06 | 1.00 | |||
Ten Seconds | Havergate | 2019 | − 1.13–05 | 4.63–07 | − 24.37 | 0.00 | |
2020 | − 1.03–05 | 6.70–07 | − 15.40 | 0.00 | |||
Isle of May | 2019 | − 1.30–05 | 7.72–07 | − 16.79 | 0.00 | ||
2020 | 2.87–07 | 1.73–06 | 0.17 | 1.00 |