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"Here’s a fictitious example to show what I’m talking about." Yes, the author's fictitious example sucks. The chart I linked shows the data points as discrete

"Here’s a fictitious example to show what I’m talking about." Yes, the author's fictitious example sucks. The chart I linked shows the data points as discrete, so it's actually the stacked column chart the author claims to prefer and eliminates the confusion between height and thickness (that said, I don't object violently to that specific issue since I know how to read the charts). Why convert curves to numbers? If you just wanted numbers read tabular data. Tufte uses the equivalent of stacked area charts in one of his most famous examples (Napoleon's attack on Russia). Is it the width or the height of the bar that connotes the strength of the army? http://www.google.com/imgres?imgurl=http://cartographia.files.wordpress.com/2008/05/minard_napoleon.png&imgrefurl=http://cartographia.wordpress.com/2008/04/30/napoleons-invasion-of-russia/&h=955&w=2003&sz=671&tbnid=2anacREESI1bUM:&tbnh=57&tbnw=120&zoom=1&usg=__6WJcpBmkRd4nkyuw0QS8AuQRayA=&docid=S0uQtYuQ0nODHM&sa=X&ei=PfjWUZyNGcaJjAL7_4CIDw&ved=0CEEQ9QEwAg&dur=389 http://www.google.com/imgres?imgurl=http://cartographia.file... Tufte's great. You can quote him on both sides of most arguments. Displaying information well requires judgment, not just a bunch of rules.

jacobparker 13y ago
The graph you linked is discrete only by technicality (all data samples are discrete, after all.) Compare how yours is 19 time slices squished together into a width (normalized for aspect ratio) almost half the size of the one I linked, which is 6 data points with adequate white-space. Please note that in the (excellent) Napoleon chart, cross sectional thickness is used to convey the size of the army. Not only is this intuitive, but it is masterfully hinted by the way the line shrinks. Stacked area charts (as detailed in the article I linked) however are unintuitive - a slowly increasing trend stacked on a faster increasing trend will appear to decrease - this is very undesirable. The chart you linked seems to want to say "The PC(+tablet) market is increasing, but Window's user base is stagnant". Either unstack the data or throw away/combine the irrelevant data. If you want to compare the Galaxy Tab to other Android tablets (as this chart seems to want to do as well) you will need a better chart or a second chart. The top of left chart is visual noise.

jacobparker 13y ago

The graph you linked is discrete only by technicality (all data samples are discrete, after all.) Compare how yours is 19 time slices squished together into a width (normalized for aspect ratio) almost half the size of the one I linked, which is 6 data points with adequate white-space. Please note that in the (excellent) Napoleon chart, cross sectional thickness is used to convey the size of the army. Not only is this intuitive, but it is masterfully hinted by the way the line shrinks. Stacked area charts (as detailed in the article I linked) however are unintuitive - a slowly increasing trend stacked on a faster increasing trend will appear to decrease - this is very undesirable. The chart you linked seems to want to say "The PC(+tablet) market is increasing, but Window's user base is stagnant". Either unstack the data or throw away/combine the irrelevant data. If you want to compare the Galaxy Tab to other Android tablets (as this chart seems to want to do as well) you will need a better chart or a second chart. The top of left chart is visual noise.