Playing with orientation and style
Sep 08, 2014
I saw this nifty chart in the Wall Street Journal last week. The Post Office is competing with Fedex and UPS on pricing. The nice feature about this small dataset is that the story is very clear. In almost every setting, the old USPS prices were higher than those of Fedex and UPS, but have been reduced to below those levels.
Below are a couple of different looks. I like the vertical scale for prices better. Long-time readers will know I prefer the second version with lines.
I like the version with lines because it makes explicit that the USPS prices are more driven by distance (within a weight segment) than UPS and Fedex.
The slope of the USPS segment lines varies directly with weight category and with distance within each weight category. The relationship between categories for UPS and Fedex doesn't seem as linear and within categories there doesn't seem to be much of a trend.
Posted by: Michael Schettler | Sep 08, 2014 at 09:37 AM
I think the lines, in *this* case, make sense since one expects distance to be a continuous variable, and they show trend over that variable.
Posted by: Nate | Sep 08, 2014 at 10:59 AM
Nate: Maybe I will one day convert some of you :) Be careful that the increments of distance are not uniform here.
Posted by: junkcharts | Sep 08, 2014 at 11:31 AM
People are altogether too concerned about drawing a line to connect points that may or may not represent a continuous variable. I'm more concerned that each data point has a marker. Then the lines are allowed to be less formal. The lines can be a Gestalt thing, and not purely an indicator of actual data.
Posted by: Jon Peltier | Sep 08, 2014 at 09:01 PM
I like the original best here.
Nice touch with the lines as movement from old light blue to new darker blue dots.
There is also the possibility visualizing all the data. A scatter plot of weights and distances with price as the size of the dot.
Posted by: Jörgen Abrahamsson | Sep 10, 2014 at 01:27 PM
I'm afraid I think the original chart illustrates the story best too.
Posted by: Ben Harris-Roxas | Sep 13, 2014 at 07:03 PM