Table 5. Model fitting to SLARs among Indo-Pacific humpback dolphins in Xiamen Bay.
| Period | Model formula | Parameter value (SE) | QAIC | ΔQAIC | ||
| QAIC: Quasi-Akaike information criterion. ΔQAIC: Variation of QAIC between current and best fit model. g: SLAR. td: Time in days. | ||||||
| 2007–2010 | Preferred companions | g(td)=a1 | a1=0.0701 (0.0051) | 12 081.6177 | 28.4464 | No support |
| Casual acquaintances | g(td)=a2e(-a1td) |
a1=0.0041 (0.0016) a2=0.0791 (0.0042) |
12 055.2454 | 2.0741 | Less support | |
| Preferred companions and casual acquaintances | g(td)=a2+a3e(-a1td) |
a1=0.0350 (4.4459) a2=0.0559 (0.0479) a3=0.0275 (0.0664) |
12 053.1731 | 0 | Best | |
| Two levels of casual acquaintances | g(td)=a3e(-a1td)+a4e(-a2td) |
a1=1.0160 (1.0574) a2=0.0040 (0.9204) a3=0.0063 (0.0739) a4=0.0785 (0.0717) |
12 059.1157 | 5.9444 | Less support | |
| 2017–2019 | Preferred companions | g(td)=a1 | a1=0.0727 (0.0097) | 3 110.5746 | 0 | Best |
| Casual acquaintances | g(td)=a2e(-a1td) |
a1=0.0008 (0.0024) a2=0.0753 (0.0145) |
3 112.2883 | 1.7137 | Substantial support | |
| Preferred companions and casual acquaintances | g(td)=a2+a3e(-a1td) |
a1=9.3991 (31.0645) a2=0.0724 (0.0098) a3=117.176 (946.1045) |
3 114.3512 | 3.7766 | Less support | |
| Two levels of casual acquaintances | g(td)=a3e(-a1td)+a4e(-a2td) |
a1=0.0008 (68.6991) a2=0.0008 (0.0205) a3=–0.6352 (179.5280) a4=0.7105 (2.6708) |
3 116.2883 | 5.7137 | Less support | |