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dan l

I actually kind of noticed this on my own with some monstrosity I created at work about a year ago. It had 3 groups, 2 bars a pop. When I had put this together, it worked. the values were all relatively close, the axis was the same, so I felt like it made sense.

Now, I looked at it's most recent run, and the numbers are pretty far off. One f the 2 bars has drastically overtaken the other and now the lesser of the bars just become noise.

Additional observations (standard disclaimer, I'm chart stupid, yada yada yada):

-the labels don't help matters I find that my eyes are trying to follow them more so the than the bars. I can't decide if this is an issue where my brain gets lazy of trying to look at the bars and just gives up and looks at the labels or if it's stylistic and it's just that the labels aren't muted.

-If you're going to have labels, I'm pretty sure you don't need the axis. If you're going to have the axis, I don't think you need the labels. If I feel like I need both, I've probably made a mistake much earlier in the process.

BEL8490

Selfreferencing?

The links(?) variability, comparing and small multiples all reference the very webpage onto which they reside. So what's the (hidden) purpose of this?

Tom West

The two things being measured have totally different units (texts/month and minutes/month), so there is no need for them to have similar scales, because there is no comparision between the two.

Rick Wicklin

As you indicate on your sister site, an alternative visualization is to plot the two groups of bars back-to-back. Although it makes it harder to directly compare Voice and Text usage by age groups, it makes it easier to see the distribution of each group. I posted a visualization of these data at my blog:
http://blogs.sas.com/iml/index.php?/archives/18-Comparing-Cell-Phone-Use-By-Age.html

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