How gerrymandered were the maps that came out of the TXLege session? How about the ongoing redistricting for the Dallas City Council?
We report...you decide! We are reporting on the Dallas City Council, US Congress, Texas Senate, and Texas House. Use the sidebar to see basic metrics and links to detailed analysis.
Dallas City Council
The following plans have been submitted to the public gallery at DistrictR. See Dallas Redistricting for more information on the plan submission process.
| PLAN |
TITLE |
MM |
MM (%ile) |
PB |
PB (%ile) |
Favors | 2D (#of total) |
| Ensemble median |
-2.69 |
50% |
0 |
67.63% | N/A | N/A | |
| Current map | 7.86 | 99.80% | 2 | 97.83% | D | 18,722 out of 9,589,284 |
|
| DCN108910 |
Current Districts Corrected Betzen | 7.86 |
99.8% |
2 |
97.83% |
D | 18,698 out of 9,589,284 |
| DCN108789 |
020322 | 4.97 |
98.05% |
2 |
97.83% |
D | 113,376 out of 9,589,284 |
| DCN108735 |
wip | 4.93 |
97.99% |
0 |
67.63% |
N | N/A |
| DCN108719 |
COD-008-Betzen | 7.84 |
99.79% |
2 |
97.83% |
D | 19,037 out of 9,589,284 |
| DCN107931 |
Betzen Map 31 | 7.47 |
99.72% |
2 |
97.83% |
D | 25,091 out of 9,589,284 |
| DCN107734 |
Betzen Map 30 | 7.46 |
99.72% |
2 |
97.83% |
D | 25,315 out of 9,589,284 |
| Want to see more? |
All Dallas City Council maps |
US Congress
As of 10/17/21, 59 plans/amendments have been filed on the Texas Legislative Council website.
| PLAN |
Submitted By |
MM |
MM (%ile) |
PB |
PB (%ile) |
Favors | 2D (#of total) |
| Ensemble median |
2.59 |
50% |
2 |
46.66% | N/A | N/A | |
| C2100 (Current map) |
|
1.25 | 30.80% |
4 |
75.03% |
N | N/A |
| C2193 |
S.B. 6 | -15.47 |
0% |
-12 |
0% |
R | 0 out of 1,500,000 |
| C2186 |
S.B. 6 | -15.48 |
0% |
-12 |
0% |
R | 0 out of 1,500,000 |
| C2185 |
REP TOTH (R) | -15.6 |
0% |
-10 |
0% |
R | 0 out of 1,500,000 |
| C2181 |
REP GUILLEN (D) | -15.58 |
0% |
-12 |
0% |
R | 0 out of 1,500,000 |
| C2180 |
REP RANEY (R) | -15.6 |
0% |
-12 |
0% |
R | 0 out of 1,500,000 |
| C2177 |
REP CROCKETT (D) | -14.5 |
0% |
-10 |
0% |
R | 0 out of 1,500,000 |
| Want to see more? |
All US Congress maps |
TX Senate
The first proposal was introduced on 9/18/21 (S2101). As of 10/17/21, 40 plans/amendments have been filed on the Texas Legislative Council website.
| PLAN |
Submitted By |
MM |
MM (%ile) |
PB |
PB (%ile) |
Favors | 2D (#of total) |
| Ensemble median |
2.14 | 50% | 1 | 41.59% | N/A | N/A | |
| S2100 (Current map) |
|
1.33 | 39.28% | 1 | 41.59% | N |
N/A |
| S2175 |
REP COLLIER (D) | -10.17 |
0.01% |
-5 |
0.39% |
R | 0 out of 617,270 |
| S2174 |
REP ROMERO (D) | -12.56 |
0% |
-5 |
0.39% |
R | 0 out of 617,270 |
| S2173 |
13-DIST FLOOR | -13.86 |
0% |
-3 |
3.34% |
R | 0 out of 617,270 |
| S2172 |
Jeff Harper | 2.94 |
61.7% |
3 |
71.96% |
D | 168,753 out of 617,270 |
| S2171 |
REP C TURNER (D) | -10.17 |
0.01% |
-5 |
0.39% |
R | 0 out of 617,270 |
| S2168 |
S.B. 4 | -12.17 |
0% |
-7 |
0.02% |
R | 0 out of 617,270 |
| Want to see more? |
All Senate maps |
TX House
As of 10/17/21, 127 plans/amendments have been filed on the Texas Legislative Council website.
| PLAN |
Submitted By |
MM |
MM (%ile) |
PB |
PB (%ile) |
Favors | 2D (#of total) |
| Ensemble median |
3.85 |
50% |
8 |
41.37% | N/A |
N/A |
|
| H2100 (Current map) |
|
2.32 |
20.72% |
6 |
23.69% |
R | 148,391 out of 1,000,000 |
| H2317 |
Gina Castaneda | -6.79 |
0% |
-22 |
0% |
R | 0 out of 1,000,000 |
| H2316 |
H.B. 1 | -5.7 |
0% |
-12 |
0% |
R | 0 out of 1,000,000 |
| H2315 |
H.B. 1 | -5.7 |
0% |
-12 |
0% |
R | 0 out of 1,000,000 |
| H2314 |
REP TINDERHOLT (R) | -5.72 |
0% |
-12 |
0% |
R | 0 out of 1,000,000 |
| H2312 |
REP RODRIGUEZ (D) | -5.72 |
0% |
-12 |
0% |
R | 0 out of 1,000,000 |
| H2310 |
7-DIST AMEND | -5.71 |
0% |
-12 |
0% |
R | 0 out of 1,000,000 |
| Want to see more? |
All House maps |
Legend for directed graphs
All TX Senate, US Congress, and TX Congress plans introduced and filed with the Texas Legislative Council as of 10/17/21. Each node contains the number of the plan and the last name of the legislator that introduced it. Node color: party affiliation, if applicable. Light colors indicate the plan has been superseded by an amendment offered by the same individual. Directed arrows: Indicate the target plan is an amendment of the source plan. Arrow numbers: the number of Census blocks that switched districts between the two plans. There are a total of about 900,000 Census blocks in Texas.
Metrics
MM = mean-median score (expressed as difference in vote share needed for majority)
MM (%ile) = percentile of MM score in ensemble
PB = partisan bias score (expressed as difference in seats won at 50% vote share)
PB (%ile) = percentile of PB score in ensemble.
Favors = Does the map favor one party relative to another, compared with the ensemble? Possible values: D/R/N (neutral)/NA (not applicable)
2D (# of total) = number of ensemble plans that score worse on both MM and PB, or are equal on PB and worse on MM. We only assessed plans which favored one party over another on both PB and MM; e.g. in contrast S2100 favors Republicans slightly on MM, but is neutral on PB.
For integer-valued quantities such as partisan bias, the percentile value is sensitive to the exact definition. We used an average between the between the "weak" and "strict" definitions (i.e. "less than or equal to" and "strictly less than"), as implemented in the SciPy stats package (stats.percentileofscore(kind='mean') ).
Methodology
We generated an ensemble of legal plans (1,500,000 for US Congress, 617,270 for TX Senate, 1,000,000 for TX House, and 9,589,284 for Dallas City Council) using Markov Chain Monte Carlo algorithms as implemented in GerryChain (MGGG, 2018). Data was compiled from the Census Bureau (population data and geographic units) and the Texas Legislative Council (election returns from the 2020 Presidential and US Senate races). Proposed plans were obtained from the Texas Legislative Council (US Congress, TX Senate, and TX House) and DistrictR (Dallas City Council). Each plan was assessed on a variety of partisan metrics; the range of observed values in the ensemble is then used to assign a percentile value to each metric as computed for each proposed plan.