Date axis and trendlines

Post Author: srmalloy
CA Forum: Charts and Graphs
I have a report that shows a number of aggregated data values with drill-down, with subreports that display month-by-month data at that drill-down level that include line charts showing several of the values, each of which has a trendline. The problem is that the horizontal axis displays the month values as 'monthnumber/year', i.e., '10/2006'. I can force the axis labels into a more readable format by going into Chart Options to the Axes tab and selecting 'Show Time Scale' under 'Show Group Axes', then clicking on one of the axis labels, selecting 'Format Axis Labels', and picking the 'Feb-02' format. I can also do this by going to the Chart Expert, selecting Numeric Axis as the type with 'Date axis line chart' as the subtype, then doing the same 'Format Axis Labels' change.The problem is that, when I do this, the trendlines become brain-dead, turning into a horizontal line across the chart well away from the actual data line. Is there some way to get the data axis labels to show in the 'mmm-yy' format while still having trendlines function properly? The main report has a dynamic parameter to allow the viewer to select which fiscal year of data they want to view, so hard-coding the axis labels as specific strings is not a viable option.

I'm sorry. Perhaps I wasn't clear. I am interested in having a graph that looks like yours (numbers on Y and dates on X), but I want to display the equation (y= Ax+B) of the trendline. R^2 seems to work fine with an axis with date values, but if I try to display the equation I get the text "Equation couldn't be calculated because one or both axes have data values." on my graph instead of the equation. KOENIG Yvan's solution is helpful in that it allows me to have an equation, but as far as I can see, I lose my date axis (X just becomes 1, 2, 3,... instead of 1/1, 1/2, 1/3...). I am hoping there is a more elegant solution than placing the two graphs on top of one another.
Also, is there a way to find the trendline for only a few points of a series without making a new series of those few points?
Thank you!

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Date axis and trendlines

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