Table 7 in First population-level study of the ammonite genus Hildoglochiceras Spath, and the Lower Tithonian record of the Hildoglochiceras Horizon in the Kachchh Basin, India

Table 7. On the basis of linear regression analysis followed by post hoc likelihood ratio test, the diameter of umbilicus is mostly dependent on the diameter of the shell and can be best modelled as the linear expression of diameter of the shell and the height of whorl. It is least dependent on the thickness of the whorl, especially when modelled alongside the diameter of the shell.
Model No.ModelAICR2Adjusted R2P-valueModel 1glm(a$U ~a$D)277.60.81960.81642.20E-16Model 2glm(a$U ~a$H)319.20.63490.62854.41E-14Model 3glm(a$U ~a$T)292.60.76750.76352.2E-16Model 4glm(a$U ~a$D+a$H)1840.96430.9631For D = 2.2E-16; For H = 2.2E-16, Overall = <2.2E-16Model 5glm(a$U ~a$D+a$T)276.60.82880.8227For D = 3.79E-05; For T = 0.0886, Overall = <2.2E-16Model 6glm(a$U ~a$H+a$T)279.10.82110.8147For FI = 0.000137; For T = 3.1E-10, Overall <2.2E-16Model 7glm(a$U ~a$H+a$T+a$D)185.40.96470.9628For D = 2.2E-16; For H = 2.2E-16, For T = 0.462, Overall = <2.2E-16Likelihood Ratio TestChi squareP-valueModel 1 vs. Model 495.6611.37E-22Model 1 vs. Model 53.8280.079Model 1 vs. Model 796.2461.26E-21Model 2 vs. Model 4137.2501.06E-31P value: Probability valueModel 2 vs. Model 642.0828.75E-11AIC: Akaike information criterionModel 2 vs. Model 7137.8351.17E-30R2: Regression coefficientModel 3 vs. Model 518.0422.16E-05Model 3 vs. Model 615.4518.64E-05Model 3 vs. Model 7111.2057.12E-25