![]() The experts insist that line charts should only be used along axes that plot numerical variables, and not for categorical factors. Instead of trying to get everything into a single chart, the data is presented as two charts, one plotting the data by rows, the other by columns. ![]() Instead of confusing the viewer by trying to render a third dimension on 2D paper or monitor, the data is plotted as 2D data, with the third dimension represented by multiple series (one series for each factor level along the third dimension). These 2D line charts are the clearest plots you’ll see of this data. In a former life I was a metallurgist, and this data was going to change the world. Here is a simple cross-tab table of data, showing how the strength of an experimental alloy varies as a function of alloy chemical composition and test temperature. ![]() ![]() Many of these are 3D types, which should be left off the palette of any serious data technician. Excel offers a great many different chart types.
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