Table 1 Parameter estimates of the best negative binomial model explaining the flight phenology of deer keds in boreal forests in Akershus and Østfold counties, Norway, 2009–2013. Under the “adding” and “removing” parameters is reported degrees of freedom (df) and difference in AIC (ΔAIC) relative to the best model (AIC = 634.4, df = 8). Jdate = Julian date (continuous), Temp = mean daily temperature (°C), Prec = mean daily precipitation (mm)
Parameter | Estimate | Std. Error | Z | P | df | ΔAIC |
|---|---|---|---|---|---|---|
Intercept | −159.000 | 19.600 | −8.07 | <0.001 | ||
Jdate | 1.150 | 0.145 | 7.97 | <0.001 | ||
(jdate)2 | −0.002 | 0.000 | −7.97 | <0.001 | ||
Temp | 0.593 | 0.144 | 4.14 | <0.001 | ||
(temp)2 | −0.022 | 0.009 | −2.59 | 0.010 | ||
Adding | ||||||
Prec | 9 | −0.14 | ||||
County | 9 | 0.76 | ||||
Year(cat) | 12 | 5.33 | ||||
Removing | ||||||
(temp)2 | 7 | 5.58 | ||||
temp + (temp)2 | 6 | 28.07 | ||||
(jdate)2 | 7 | 67.20 | ||||
jdate + (jdate)2 | 6 | 65.51 | ||||