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July 15th, 2008, 01:34 AM   #1
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graph aggregation

If I set a target for a reduction in spend from $4 to $2 over the period 01/01/2008 to 01/05/2009 (say 500 days) my daily reduction rate is 2/500 = $0.004 per day.

This assumes that I spend $4 per day initially, and then by 01/05/2009 spend $2 per day.

Now, if I would like to show what my monthly reduction must be, for January for example, what is my start value, is it (31 x 4 = 124) ?? and is my monthly reduction then (31 x 0.004 = 0.124) so that at the start of January my value is 124 and at the end of January is (124 - 0.124) = 123.876 ??

Similarly, what would my Quarterly start and end value be and the gradient of this line if I were to plot this daily reduction whilst altering the way that I divide my time view?

Any help would be greatly appreciated,

Many thanks

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July 15th, 2008, 09:59 PM   #2
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Since your spend is being gradually reduced, you need to invent a definition of monthly spend, which could be, say, 31 times the initial daily spend for a 31-day month, or 31 times the average daily spend over the course of that month. Other definitions are possible. I don't understand the phrase "whilst altering the way that I divide my time view".
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