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I mostly agree with your analysis, except for one thing. Having the areas without have the same (no) pattern and a "blending in" grey colour would be a mistake.

For one thing, charts are still frequently printed out, or even copied, and can easily lose the colour information in the process. Also, people with some forms of colour blindness will be unable to distinguish a pale blue and a grey.

In either kind of situation, you lose the "No data" information and falsely assign data values to those areas. Keep a separate pattern and you don't risk losing the information.


Interesting how dark Illinois is because of Chicago.


I suspect altitude - and hence, the difference in octane level of regular gas - was not adjusted for.


derek, David: be careful what you wish for. Adjusting for something effectively removes its effect on the statistic so if you adjust for everything you know about, you might end up with a undifferentiated blue!


Kaiser - that's the point! You *need* to adjust for octane level ... regular is only 85 octane in Colorado, so it should be cheaper than the rest of the nation. Adjust/account for it to verify that.

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