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Hadley Wickham

Why not sort the y-axis by mpg? Then the three groups would naturally fall out, and then wouldn't be the large "jumps" between the different groups.


Hadley: I was thinking from a consumer perspective, you're either in the market for a sedan or a truck. I'd have put clear dividers between the three groups.


It would be interesting to see this expressed and visualised as a percentage reduction. I guess this must be how they calculate the changes.


Jens, or plotted on an exponential scale, which will show up the same thing: whether there is a constant ratio between "before" and "after".

The exponential scale will have the advantage of not destroying the original values, as a percentage operation does.

(The mischeivous side of me wants to find the size of the fuel tanks in gallons, plot that as a log-log scatter graph, and draw diagonal lines for the nominal range of the cars on a single full tank :-)



I agree with Hadley. Why?

Because the whole point of having hybrid cars is that people will choose them over cars with high (and unknown future) running costs. So they are 'sedans' really.

If you want an ordering variable I would use the product of wheelbase & distance between front & back wheels. This is a measure of usable space for people or load into the vehicle. You might sqrt that product too of course.

If you sorted by mileage you could colour by vehicle 'group'.

I do not think miles per full tank will work well because manufacturers put bigger tanks in vehicles that use more petrol. Miles per $100 might work better.

Sorry, I am late to the commenting party...
Nice blog though. :-)


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