Moving Averages OCR Stage 8.

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Presentation transcript:

Moving Averages OCR Stage 8

Why use them? Moving Averages, when graphed, allow us to see any trends in data that are cyclical By calculating the average of 2 or more items in the data, any peaks and troughs are smoothed out.

Year 1996 1997 1998 Quarter 1 2 3 4 Sales 189 244 365 262 190 266 359 250 201 259 401 265 265 269.25 265.25 270.75 4 Period Moving Average

Year 1996 1997 1998 Quarter 1 2 3 4 Sales 189 244 365 262 190 266 359 250 201 259 401 265 4 period Moving Average Quarters 1-4 2-5 3-6 4-7 5-8 6-9 7-10 8-11 9-12 Moving Average 265 265.25 270.75 269.25 266.25 269 267.25 277.75 281.5

Year 1996 1997 1998 Quarter 1 2 3 4 Sales 189 244 365 262 190 266 359 250 201 259 401 265 Quarters 1-4 2-5 3-6 4-7 5-8 6-9 7-10 8-11 9-12 Moving Average 265 265.25 270.75 269.25 266.25 269 267.25 277.75 281.5 500 400 x x x 300 x x x x x x x x x x x x x x x 200 x x x 100 1 2 3 4 1 2 3 4 1 2 3 4 1996 1997 1998