Table 2.

Likelihood-ratio test between the models

Induction	Weak	Medium
(d0, d1)	p-value	p-value
(1, 2)	3.10 × 10-14	3.57 × 10-9
(2, 3)	0.4451	0.0955
(3, 4)	0.7186	1

Likelihood-ratio test between pairs of models. Null model is d₀ step model (where d₀ equals 1, 2, or 3) while the alternative model is a d₁ step model (where d₁ = d₀+1), in the regimes of weak and medium induction. For p-values smaller than 0.01, it is generally accepted that the null model should be rejected in favour of the alternative. The single step model is insufficient in both regimes.