Exercise 3.1

For the following series, find an appropriate Box-Cox transformation in order to stabilise the variance.

autoplot(usnetelec)

(lambda <- BoxCox.lambda(usnetelec))
## [1] 0.5167714
autoplot(BoxCox(usnetelec,lambda))

autoplot(usgdp)

(lambda <- BoxCox.lambda(usgdp))
## [1] 0.366352
autoplot(BoxCox(usgdp,lambda))