In the example from Section 6.7.4 we used the smoother function s. Change this to te to use the tensor product smoother. How do the resulting contours change, if it all? Write a test function to...

In the example from Section 6.7.4 we used the smoother function s. Change this to te to use the tensor product smoother. How do the resulting contours change, if it all?

Write a test function to compare the mgcv function with the gam package’s gam function. How well do the models match one another? Include a timing element as well. Which model runs faster?