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Creating a total cost chart where a component cost is a step cost
Hi, I've referred to Andy's step charts at
http://www.andypope.info/charts/stepchart.htm where he duplicates x values in order to create sharp straight steps in an XY scatter diagram. However, I don't want to duplicate x values. Rather, I created a dataset as follows Volume Step Cost 0 0 1 20 100 20 101 40 200 40 201 60 300 60 301 80 and the pattern continues to 4000. The XY scatter diagram chart that is created is incorrect. The chart line steps up from 0 to a y value of 20 at x=1, stays flat to x=100, then climbs as a diagonally straight line to the y value corresponding to x=1000, at 1001 it steps up by an increment of 20, then stays flat to x=1100, then climbs diagonally up as a straight line to the y value corresponding to x=2000, and the pattern continues. Weird!! Especially weird is the fact there are discontinuities in the line at x=1, 100, 1000, 1100, 2000, 2100, 3000, 3100 etc but not at x=200, 300 etc thru to 900, 1200,1300,1400 thru to 1900, 2200, 2300, thru to 2900, etc etc. I need to add this step cost data with other cost types so as to graph total cost. Therefore manipulating the data in order to create the correct picture is not an option ... I want Excel to "do it right". Any ideas why this is going wrong please? I'm using Excel 2007. TIA .... Greg |
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