Because it is impossible to calculate a moving average for the first 2 and last 2 quarters.

(I do assume that you have read our Course Notes and therefore realise that you can no longer be asked calculations on time series in Paper F5. She can only expect you to know the idea.)

ktk89 says

sir y you are ignore the 1st two quatr and last 2 quater?

John Moffat says

Because it is impossible to calculate a moving average for the first 2 and last 2 quarters.

(I do assume that you have read our Course Notes and therefore realise that you can no longer be asked calculations on time series in Paper F5. She can only expect you to know the idea.)

ktk89 says

thank you sir

tauraiversatile says

cool

Dthind says

Great work!!

Miss A.. says

nice