Clean up the data: use only one row for the column headers. Include units in the same cell, or better, leave them off.

Select the “Coulomb” column, then hold CTRL while you select the “pH” and “Phosphate” columns. Create an XY chart. Excel should use the first column as X values and the other two as Y values. Right click the Phosphate series, choose Format, and on the main tab (2007) or on the Axis tab, choose Secondary.

Kindly assist me in plotting a XY Graph with Coulombs on X-axis,on the Y-axis I need Phosphate as primary (on the left hand side) and pH secondary (on the right hand side).I use Office 2007 and sometimes Ofiice 2003 and I did manage to plot the graph of Phosphates Vs Coulombs but I am struggling to add pH on the right hand side of the same graph.Please find the sample of the data that I am trying to plot the graphs for.

Thanks in advance,
Christopher

Time(s) Current(A)Coulomb Voltage(V) pH(mV) Phosphate
(A.s/L) (mg/L P)
0 1.12 0 0.5 3.2 0.8
1200 1.12 1344 0.6 2.95 0.72
2400 1.12 2757 0.7 2.88 0.68
3600 1.12 4244 0.8 2.78 0.65
4800 1.12 5812 0.9 2.72 0.56

Have you ensured that you have a Date (Time-Scale) Axis? In the base unit defined as Days?

Are your dates numerical or text? It only takes one text value to mess up the whole list.

Whatever I try, the data does not plot according to the date, but rather plots each data point sequentially. So the monthly data over the same time period takes up only a quarter of the graph taken up by the weekly data.

Do you know how to work around this?

In order to stack two series, you should have a value at each category (date) for each series. In this case, you can’t keep the blanks in the data. It is probably easiest to sort by date, then interpolate to fill the blanks, either manually or with formulas.

But what if you wanted the chart to be stacked lines, showing a cumulative total of two sets of data being tracked, where the amounts for each line fluctuate on different days, but you want to see the combined sum plotted over time? Is that possible?

My problem is I’m showing 2 years worth of data, and multiple products being tracked, (the user selects the product and what months data) and the graph switches its ranges. So I can’t format it into one great big table,

Is there any way to get a Bar chart and a Line (line or xy scatter) to plot on 1 time line (x axis)?

If your monthly data is to be plotted as markers, you need some kind of day to go with the month. Pick one that makes sense: the first, the last, the 15th.

Or you could do a combination line-bar chart, with line on the primary and bar on the secondary (or vice versa), and fudge around with the two axes so the month axis (category or text type) and the day axis (time or date scale) match up as well as possible.