Question

Point out the wrong statement.

(a) Asymptotics are used for inference usually

(b) Adding squared terms makes it continuously differentiable at the knot points

(c) Adding squared terms makes it twice continuously differentiable at the knot points

(d) None of the mentioned

I had been asked this question in unit test.

The query is from Binary and Count Outcomes in section Statistical Inference and Regression Models of Data Science

Answer 1

Right answer is (c) Adding squared terms makes it twice continuously differentiable at the knot points

The explanation is: Adding cubic terms makes it twice continuously differentiable at the knot points.