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Even when Show Me won't allow you to select a line graph, you can always go to the Marks card and choose the Line from the Mark type drop-down menu.
There are a variety of reasons why Tableau might not be able to draw a line, or have the lines not look like how you want. If you still need help, could you post a packaged workbook (.twbx) with some sample data?
thanks for the tip, but that didn't do the trick. But now i may narrowed down the problem, i think tableau does not know that it should associate my data with four time periods, so it won't put some dates in the x-axis. Putting the values in the y-axis(row)-field gives only garbage unfortunatly. I tried to define some parameters/dates, but that did not get me very far until now.
So here's my workbook attached, the last sheet labeled Test - ... is my last attempt. Everything else before is fine without lines. Ideally all lines in the last sheet would be labeled with the appropriate country name and all four categories on the x-axis a four point timeline. I left the country names for better understanding in the colum field.
See the "Import Dependency Line" in the attached. Since you are trying to draw lines on a single axis for data that resides in different columns (the 4 measures), I had to a) use Measure Names/Values to get the different values into the view, and b) use the Path shelf to tell Tableau how to connect the lines. If the Measure Names don't have the right alphabetical sort, you can click on the blue Measure Names pill and give it the correct sort order (or just drag the pills on the Measure Values card around).
An alternative would be to reshape your data so there is one row per country/5 year interval with each measure appearing once, then you could use the 5 year interval instead of Measure Names for the axis.
Errm, i see... that i don't see. Hope we didn't cross edit the workbook :-( (i think i closed it after upload), but tableau tells me that there is a newer version... which does not look very different from my upload - and of course it only loads the newer version. Argh.
Though i can reproduce step a) in my original Workbook. What did you put in the path shelf exactly...? Sorry for the inconvenience.
Wohooo. Finally. After more fiddeling everythings well. Thanks for ya help Jonathan.
Marking this thread as solved