For the following series, find an appropriate Box-Cox transformation and order of dierencing in order to obtain stationary data. a. usnetelec b. usgdp c. mcopper d. enplanements e. visitors For the...

For the following series, find an appropriate Box-Cox transformation and order of dierencing in order to obtain stationary data.

a. usnetelec

b. usgdp

c. mcopper

d. enplanements

e. visitors

For the enplanements data, write down the dierences you chose above using backshift operator notation.