Question

Consider forward selection, backward selection and best subset selection with respect to the same data set. Which of the following is true?
Best subset selection can be computationally more expensive than forward selection
forward selection and backward selection always lead to the same result
best subset selection can be computationally less expensive than backward selection
best subset selection and forward selection are computationally equally expensive
both (b) and (d)

Answer 1

'Forward selection and backward selection always lead to the same result' and 'best subset selection can be computationally less expensive than backward selection' is the correct answer.

Explanation:

• These are the active sets of variables to re optimized them all.

• Backward and forward steps are the different steps of the statistics.

• It contains the predictor for the forwards and backward steps.

Answer 2

Answer:

Forward selection and backward selection always lead to the same result and best subset selection can be computationally less expensive than backwards selection is the correct Answer.

• There are the active sets of variables to re optimized them all.

• Back ward and forward steps are the different steps of the Statstatics.

• It contains the Predicator for the forward and the backward steps