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Summary Stats for Public Maps 0001-0068

With 68 publicly proposed maps in-hand (and more on the way, based on our email inbox), you may be looking for a way to compare the public’s ideas to each other and to the current State House, State Senate and congressional maps.

The “Summary Statistics for Public Maps 0001-0068” document available at (and below) gives you summary breakdowns by race, ethnicity, population deviation, county splits and city splits for each of the first 68 publicly proposed maps and the current House, Senate and congressional maps.

As always, email us at if you have any questions.  Enjoy!

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5 Responses - Comments are closed.

  1. Scratch the above. I was looking at the wrong column for perimeter. Lots of numbers! While area compactness still might be a valuable measurement, in this case it agrees with the perimeter comparison. Current 11’s perimeter length is about twice as long as 0070’s 11, not 7% longer. Perimeter twice as long means district is half as compact by perimeter, and that’s almost the same answer my method got.

  2. I appreciate that the effort was made to compile all this data. I imagine that some of the data comes out pretty automatically, but others were a little more tedious and time-consuming to report.

    What I want to take issue with is that the only measure of compactness you offer is total perimeter of district lines. Instead of this, you should be looking at area compactness, which is a unitless ratio for each district shape.
    It is: Area squared, divided by 2pi* polar moment of area.
    If you only look at perimeter, 2002 US House district 11 is only about 7% longer than the district 11 proposed by plan 0070. The perimeter comparison is not capturing the dramatic difference of chopping off three appendages that cross Tampa Bay, the Manatee River, and oddly hug the Eastern bay shore.
    However the area compactness comparison does capture the difference. The current district 11 scores a 0.46 out of 1 while Plan 0070’s district 11 scores 0.96 out of 1. I have an Excel spreadsheet that works out these numbers for these and many other proposed districts if you are interested to see the math. It is tedious to apply the formula by cutting and pasting to new district lines of varying sizes, but the process could definitely be automated using a higher level programming language.

    • Michael, we’re going to be introducing several measures of compactness into the process to make sure that there is a comprehensive and appropriate view of compactness. This is just the first measurement we used in a report, and it was a way to begin introducing measurements like this to the members of the House redistricting committees.

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