July 15th, 2008, 01:34 AM  #1 
Newbie Joined: Jul 2008 Posts: 1 Thanks: 0  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 Alex 
July 15th, 2008, 09:59 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 17,910 Thanks: 1382 
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 31day 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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