Table 12.

An artificial quadratic example¹.

Point	x2	x3	y
1	.2	.04	28.3
2	.4	.16	27.5
3	1	1.00	25.6
4	2.1	4.41	2S.7
5	3.6	12.96	46.4
6	4.7	22.09	69.8

¹y = β₁x₁ + β₂x₂ + β₃x₃ + ϵ; β₁=30, β₂=8, β₃=3.5, σ_e=0.2 x₁ = 1.

Note that $x_3=x_2^2$.