Cynon Valley: Seat, Ward and Prediction Details

Cynon Valley: Overview

 Prediction: LAB hold 

MP at 2017: Ann Clwyd  (LAB)
County/Area: Mid Glamorgan (Wales)
Electorate: 51,332
Turnout: 62.0%
2017
Votes
2017
Share
Predicted
Votes
LAB19,40461.0%60.0%
CON6,16619.4%16.4%
Plaid4,37613.8%13.8%
UKIP1,2714.0%6.9%
LIB5851.8%1.9%
Green00.0%1.1%
LAB Majority13,23841.6%Pred Maj 43.6%
Chance of
winning
LAB
98%
CON
2%
Plaid
0%
UKIP
0%
LIB
0%
Green
0%

Cynon Valley : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the Cynon Valley constituency, the 'Wales' area and nation.

The political measures include the Left/Right and International/National axes (what does this mean).

The demographic measures are from the 2011 Census and include categories relating to national identity, economic activity, health and education. These categories are those which have the most relevance to political attitudes.

IndicatorSeatWalesAll GB
Party WinnerLABLABCON
Economic Position19° Left10° Left
National Position1° Int3° Int1° Int
EU Leave %58%53%52%
British Identity18%26%29%
Good Health44%47%48%
UK Born97%95%88%
Good Education28%36%39%
Good Job40%46%51%
High SEC37%46%51%
Average Age49.249.648.5
ABC1 Class38%47%53%

Cynon Valley ranks #215 for "Leave", #618 for "Right" and #421 for "National" out of 650 seats.

Indicators: Legend and Descriptions

Indicators : Legend and Descriptions

The colour scheme used in the table above is explained in the legend table below. The eight census indicators (British Identity, Good Health, UK Born, Good Education, Good Job, High SEC, Average Age and AB1 Class) all use the same 'Census' colour scheme indicating whether the area's level is above or below the national average.

TopicCat 1Cat 2Cat 3Cat 4Cat 5
Economic PositionVery LeftLeftCentristRightVery Right
National PositionVery IntInternationalCentristNationalVery Nat
EU Leave %Very RemainRemainBalancedLeaveVery Leave
CensusVery LowLowMediumHighVery High

Indicator definitions are given in terms of political data definitions or census categories:

IndicatorCensus
Question
Definition / Included Census Categories
Party WinnerArea party winner : actual election result or projected by Electoral Calculus
Economic PositionEconomic position between 100° Left and 100° Right, estimated by Electoral Calculus from political and demographic data.
National PositionNational position between 100° International and 100° National, estimated by Electoral Calculus from political and demographic data.
EU Leave %EU Referendum vote share for 'Leave' : actual result or estimate
British IdentityNational Identity (KS202)Those answering British, British-Other, or Scottish-British
Good HealthHealth (KS301)Those answering 'Very Good Health'
UK BornCountry of Birth (QS203)Those answering England, Northern Ireland, Scotland, Wales, GB Other, or UK Other
Good EducationHighest level of Qualification (QS501)Level 3 (A-level equivalent) or Level 4+ (degree equivalent)
Good JobOccupation (QS606)Occupation codes 1xx to 4xx (Managers, Professionals, Associates, and office workers)
High SECNS-SeC of Household Reference Person (QS609)National Statistics Socio-economic Classification from 1 to 4 (higher managers and professionals, lower managers and professionals, intermediate occupations, small employers and self-employed).
Average AgeAge (QS103)Average age of adults (18 years and above)
ABC1 ClassApproximated Social Grade (QS611)Approximated social grades A, B and C1

Cynon Valley: Map

Boundary Lines courtesy of Ordnance Survey OpenData © Crown copyright 2015

Cynon Valley: Ward-by-ward

Workings for Cynon Valley

This section gives an estimate of the votes cast in each ward of Cynon Valley at the general election of 2017. The official ward breakdowns are not officially tabulated or published, so these numbers are only approximate. The basic idea of the calculation is to look at the district council wards which make up the new seat, and estimate how they voted in 2017, and also to predict how they will vote at the next election. These estimates are based both on the recent local election results and the Census 2011 demography in those wards, with adjustments made to allow for different turnouts and different voting patterns for local and general elections.

Usuallly each ward lies entirely within a single constituency, but some large wards are split between several constituencies (particularly in Scotland and Northern Ireland). The electorate figure shown is the estimate of the electorate which is common to both the constituency and the particular ward, and can be very small.

Election results from a recent local election are given. This is usually the local election closest to 2015 from the period 2012-2015. For multiple-member wards, the votes shown are the sum of the votes cast for all candidates of each party. A negative number indicates candidate(s) elected unopposed.

Calculation method

There are a few problems with using the raw (actual) local election results to imply general election results ward-by-ward. Firstly, turnout can be different between local and general elections, which means that the total number of local votes cast does not equal the number of votes cast in each old seat at the general election. To correct for this, we adjust the local votes to match the general election turnout. Each ward's result is scaled, whilst keeping constant the percentage support for each party, so that the total turnout adds up to the old seat's general election turnout. All wards in the old seat are assumed to have the same percentage turnout.

Because not all parties have a candidate in each ward, and sometimes there is only a single candidate elected unopposed, the local election results can understate a party's true support. To correct for this, we also use Census demography to make an alternative estimate of how the ward voted in the general election, based on any demographic differences between the ward and the seat overall.

Both method are then combined together, and the votes are subject to a final adjustment to make sure that the totals over the wards add up to the general election seat total, as they must.

Raw vote and Estimated General Election vote

The raw vote table shows the district council election results for all the wards in the seat of Cynon Valley. The first block shows the actual results, the second block shows the turnout-adjusted results. The final block shows the estimated general election votes for each ward after all the processes are complete.

Cynon ValleyActual Results
DistrictWardElection
Year
CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
Other
Votes
Rhondda Cynon TafAberaman North201201,6810003960
Rhondda Cynon TafAberaman South201201,7510008510
Rhondda Cynon TafAbercynon201201,584650161334519
Rhondda Cynon TafAberdare East201202,6830005780
Rhondda Cynon TafAberdare West / Llwydcoed201203,5190002,8820
Rhondda Cynon TafCilfynydd201203541320057189
Rhondda Cynon TafCwmbach201207570004360
Rhondda Cynon TafGlyncoch20120-100000
Rhondda Cynon TafHirwaun201204520007120
Rhondda Cynon TafMountain Ash East201203560005440
Rhondda Cynon TafMountain Ash West201201,6550005740
Rhondda Cynon TafPen-y-waun20120378000169228
Rhondda Cynon TafPenrhiwceiber201202,051000473135
Rhondda Cynon TafRhigos2012034100018775
Rhondda Cynon TafYnysybwl201255587414003160

Cynon ValleyTurnout-adjusted Results
DistrictWardElectorate
2017
CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
Other
Votes
Total
Votes
Rhondda Cynon TafAberaman North3,96301,98400046702,451
Rhondda Cynon TafAberaman South3,46001,44000070002,140
Rhondda Cynon TafAbercynon4,76501,7537201783705742,947
Rhondda Cynon TafAberdare East4,77502,43000052302,953
Rhondda Cynon TafAberdare West / Llwydcoed6,95002,3630001,93504,298
Rhondda Cynon TafCilfynydd2,1040629235001013361,301
Rhondda Cynon TafCwmbach3,28701,29000074302,033
Rhondda Cynon TafGlyncoch2,13301,319000001,319
Rhondda Cynon TafHirwaun3,11907490001,18001,929
Rhondda Cynon TafMountain Ash East2,173053200081201,344
Rhondda Cynon TafMountain Ash West3,37201,54800053702,085
Rhondda Cynon TafPen-y-waun2,29006910003094171,417
Rhondda Cynon TafPenrhiwceiber4,28002,0420004711342,647
Rhondda Cynon TafRhigos1,269044400024398785
Rhondda Cynon TafYnysybwl3,481869216500049602,153
 Total51,4218620,13595701788,8871,55931,802

The turnout-adjusted results are now combined with the implied results from the Census Demography calculation, and then adjusted to match the general election totals. The results of these calculations are shown in the table below.

Cynon ValleyEst. 2017 General Election Results
DistrictWardElectorate
2017
CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
Other
Votes
Total
Votes
Rhondda Cynon TafAberaman North3,9562981,7842061028802,451
Rhondda Cynon TafAberaman South3,4543421,429375029002,139
Rhondda Cynon TafAbercynon4,7576781,74469181027502,947
Rhondda Cynon TafAberdare East4,7675012,0374568030302,954
Rhondda Cynon TafAberdare West / Llwydcoed6,9381,0302,28245161078004,298
Rhondda Cynon TafCilfynydd2,1003616379673013401,301
Rhondda Cynon TafCwmbach3,2814191,231456032302,033
Rhondda Cynon TafGlyncoch2,1291091,10871707801,319
Rhondda Cynon TafHirwaun3,114413998372044301,929
Rhondda Cynon TafMountain Ash East2,1693485922888028801,344
Rhondda Cynon TafMountain Ash West3,3663111,3741198029102,085
Rhondda Cynon TafPen-y-waun2,286314876162016301,416
Rhondda Cynon TafPenrhiwceiber4,2733561,86012106031302,647
Rhondda Cynon TafRhigos1,26720941803101280786
Rhondda Cynon TafYnysybwl3,4754771,035241121027902,153
 Total51,4216,16619,4055851,27004,376031,802

Predicted ward-by-ward votes for Cynon Valley

This table shows the predicted general election result broken down over each ward in the seat of Cynon Valley.

Cynon ValleyPredicted Results
DistrictWardElectorate
2017
CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
Plaid
Votes
Other
Votes
Total
Votes
Rhondda Cynon TafAberaman North3,9562471,759211152128802,451
Rhondda Cynon TafAberaman South3,4542831,40741322229002,138
Rhondda Cynon TafAbercynon4,7575771,714712743627502,947
Rhondda Cynon TafAberdare East4,7674152,007461503230302,953
Rhondda Cynon TafAberdare West / Llwydcoed6,9388822,239472975378004,298
Rhondda Cynon TafCilfynydd2,100316624971141613401,301
Rhondda Cynon TafCwmbach3,2813491,21051202532302,032
Rhondda Cynon TafGlyncoch2,129901,09574097801,319
Rhondda Cynon TafHirwaun3,11434797941332444301,930
Rhondda Cynon TafMountain Ash East2,169302578291311628801,344
Rhondda Cynon TafMountain Ash West3,3662581,353121512029102,085
Rhondda Cynon TafPen-y-waun2,28626586221071716301,416
Rhondda Cynon TafPenrhiwceiber4,2732951,833131692431302,647
Rhondda Cynon TafRhigos1,267182410056101280786
Rhondda Cynon TafYnysybwl3,4754031,0132421892627902,152
 Total51,4215,21119,0836002,1783514,376031,799

Please note that general election results and electorates are not officially made available ward-by-ward. The numbers shown are our best estimates for these figures, but are not official.


© 2017 Martin Baxter
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