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District Statistics
District Statistics
This presents key statistics about the districts in your map, side by side for easy comparison.
Alec Ramsay
Jan 28, 2020
Analytics
Analytics
When you click on the “Analytics” command in DRA 2020, you will see a bird’s-eye view that distills the essential characteristics of your…
Alec Ramsay
Jun 13, 2020
Advanced
Advanced
The “Advanced” command in DRA 2020 presents in-depth information about the partisan characteristics of the map.
Alec Ramsay
Jun 13, 2020
Ratings
Ratings
When you click on the new “Ratings” command in DRA 2020, you will see a bird’s-eye view that distills the essential characteristics of…
Alec Ramsay
Jun 3, 2020
Comparing Maps
Comparing Maps
When you click on the Compare tab in DRA 2020, you now get a suite of tools for comparing your map other maps.¹
Alec Ramsay
May 21, 2021
Requirements for Maps
Requirements for Maps
The “Requirements” section of “Analytics” view shows you whether the map meets four general constraints for valid maps.
Alec Ramsay
Aug 7, 2020
Embedded Districts
Embedded Districts
You may wonder where the requirement that districts not be embedded within other districts comes from. The short answer is that you won’t…
Alec Ramsay
Sep 9, 2020
‘Roughly’ Equal Population
‘Roughly’ Equal Population
You may wonder where the equal population thresholds in DRA 2020 come from. The short answer is from case law. The details are below.
Alec Ramsay
Sep 9, 2020
Evaluating Partisan Performance
Evaluating Partisan Performance
You can evaluate the partisan characteristics of a map three different ways in DRA 2020:
Alec Ramsay
Sep 23, 2020
Evaluating Competitiveness
Evaluating Competitiveness
You can evaluate the competitiveness or responsiveness of a map three different ways in DRA 2020:
Alec Ramsay
Sep 23, 2020
Proportionality
Proportionality
When you click on “Analytics” in DRA 2020, the “Proportionality” section helps you understand the degree to which the map is fair.
Alec Ramsay
Jun 26, 2020
Competitiveness
Competitiveness
When you click on the “Analytics” command in DRA 2020, the “Competitiveness” section helps you understand the degree to which the map is…
Alec Ramsay
Jun 13, 2020
Minority Representation
Minority Representation
When you click on the “Analytics” command in DRA 2020, the “Minority Representation” section presents data that helps you assess …
Alec Ramsay
Jun 3, 2020
Compactness
Compactness
When you click on the new “Analytics” command in DRA 2020, the “Compactness” section helps you understand the degree to which the…
Alec Ramsay
Jun 3, 2020
Splitting
Splitting
When you click on the new “Analytics” command in DRA 2020, the “Splitting” section helps you understand the degree to which the districts…
Alec Ramsay
Jun 3, 2020
Two Definitions of “Fair”
Two Definitions of “Fair”
We evaluate how fair a map is politically in two different ways in DRA 2020:
Alec Ramsay
Jul 7, 2020
Election Composites
Election Composites
When you click on Analyze to analyze a map in Dave’s Redistricting, you see a table of District Statistics. You may have noticed that the…
Alec Ramsay
Feb 7, 2020
Measuring County & District Splitting
Measuring County & District Splitting
This note explains how we adapted Professor Moon Duchin’s metrics for county- & district-splitting in DRA 2020.
Alec Ramsay
Jun 3, 2020
Rank-Votes Graph
Rank-Votes Graph
The first section you see when you choose the “Advanced” command in DRA 2020 shows a rank-vote graph for the map — a rich, visual way to…
Alec Ramsay
Jun 19, 2020
Seats-Votes Curve
Seats-Votes Curve
When you choose the “Advanced” command in DRA 2020, you can see a seats-votes curve for the map — a powerful way to understand how biased…
Alec Ramsay
Jun 19, 2020
Advanced Measures of Bias & Responsiveness
Advanced Measures of Bias & Responsiveness
When you click on the “Advanced” command in DRA 2020, the “Advanced Metrics” section shows a baker’s dozen advanced measures of bias &…
Alec Ramsay
Jun 13, 2020
Compactness by District
Compactness by District
When you click on the “Advanced” command in DRA 2020, a section shows you district-by-district compactness measurements.
Alec Ramsay
Nov 18, 2020
Demographic Voting Analysis
Demographic Voting Analysis
When you click on the “Advanced” command in DRA 2020, a section lets you analyze voting patterns by race & ethnicity.
Alec Ramsay
Nov 18, 2020
Ratings: Deep Dive
Ratings: Deep Dive
On the Analyze tab in DRA, we rate five key dimensions of redistricting maps: proportionality, competitiveness, opportunity for minority…
Alec Ramsay
Oct 9, 2021
Compact Districts Aren’t Fair
Compact Districts Aren’t Fair
Now that I have your attention, let me be more precise: Compact districts aren’t always fair. In fact, increasingly they are not…
Alec Ramsay
Feb 5, 2021
Contiguity
Contiguity
For a map to be considered valid in DRA 2020, each district must be contiguous, meaning that all precincts (or blocks) in that district…
Alec Ramsay
Apr 9, 2021
DRA and VRA
For those drawing and re-drawing redistricting maps through DRA, it is important that any map comply with the Voting Rights Act. Maps that…
Rick Pildes
Jul 15, 2021
What’s Going On With Splitting?
What’s Going On With Splitting?
Oy! Sorry for the churn on splitting ratings for state legislative maps.
Alec Ramsay
Oct 1, 2021
About Dave’s Redistricting
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