additive variations

taskey
Registered Posts: 1,800
evening all
I am a little bit stuck.
i am doing the bpp book for additive variations.
I am working my way through - but this bit i cannot work out.
i have attached a file to this message.
i dont understand how the seasonal variation is worked out. it has given me the formula Y - T but no matter how i work it, i do not get to the figures in the final column.
i thought i could figure this out, but been looking at it for an hour now and am stuck.
Hope some one can help - i am sure they can
Many thanks
Tracy
I am a little bit stuck.
i am doing the bpp book for additive variations.
I am working my way through - but this bit i cannot work out.
i have attached a file to this message.
i dont understand how the seasonal variation is worked out. it has given me the formula Y - T but no matter how i work it, i do not get to the figures in the final column.
i thought i could figure this out, but been looking at it for an hour now and am stuck.
Hope some one can help - i am sure they can
Many thanks
Tracy
0
Comments
-
They have worked out the trend by taking a 4 period moving average. This is then used to work out the seasonal variation against the underlying trend. The 4 period average for the Yr 5 Q3 is 650
((600+840+420+720)/4)+((840+420+720+640)/4)/2
the actual sales in Yr 5 Q3 was 420.
Actual - Trend = seasonal variation
420 - 650 = -2300 -
that makes sense - it was staring me in the face but could not see it
thanks
Tracy0
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