Epsom and Ewell: New Boundaries 2018 Calculation

Epsom and Ewell: Overview

 Projection: CON seat 

Implied MP at 2017: Chris Grayling  (CON)
County/Area: Surrey (South East)
Electorate: 77,417
Turnout: 76.6%

 Implied 2017 VotesImplied 2017 Share
CON35,31359.6%
LAB14,83825.0%
LIB7,40112.5%
Green1,7142.9%
CON Majority20,47534.5%

See overview of other seats in South East.

Epsom and Ewell : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Epsom and Ewell constituency, the 'South East' 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.

IndicatorSeatSouth EastAll GB
Party WinnerCONCONCON
Economic Position6° Right4° Right
National Position1° Nat3° Nat1° Int
EU Leave %48%52%52%
British Identity28%29%29%
Good Health49%49%48%
UK Born93%88%88%
Good Education39%43%39%
Good Job54%56%51%
High SEC56%57%51%
Average Age48.649.248.5
ABC1 Class58%60%53%

Epsom and Ewell ranks #416 for "Leave", #182 for "Right" and #331 for "National" out of 600 new 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

Epsom and Ewell: Map

Boundary Lines courtesy of Ordnance Survey OpenData © Crown copyright 2015

Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Epsom and Ewell been in force at that time. 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. This estimate is based on the recent local election results in those wards, with adjustments made to allow for different turnouts and different voting patterns for local and general elections.

In many cases, wards are divided between several old constituencies or between new constituencies. So the same ward may be shown more than once, but the electorate shown will reflect that ward sub-section.

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 two 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.

Secondly, even though we now have the correct number of votes in the old seat, the party totals will not match the general election result. Some parties do better at the local election than the general election, and others do vice versa. We call these strong and weak parties respectively. The next step is to transfer votes from strong parties to weak parties. This is done by taking votes proportionally away from strong parties and putting them in a transfer pool. For instance if a party got 12,500 local votes, but only 10,000 general election votes, it will lose 20% over all the wards. These votes in each ward will be put in the ward's transfer pool and allocated to the weak parties. Weak parties will get votes transferred to them in proportion to the votes they need over the old seat. For instance, if two weak parties need 4,000 and 1,000 votes respectively, the first party will get 80% of each ward's transfer pool and the second party will get 20% of each ward's transfer pool. The transfer of votes between parties is done using the Electoral Calculus Transition Model.

More details of the calculation formulas are available.

List of old seats forming part of Epsom and Ewell

The old seat(s) needed are:

Old seat: Epsom and Ewell

The table shows the transfer-adjusted results for each ward in the old seat of Epsom and Ewell, as well as showing which new seat each ward is in.

Old seat: Epsom and EwellTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
Epsom and EwellAuriol3,104Epsom and Ewell1,4185083080650002,299
Epsom and EwellCollege4,558Epsom and Ewell2,0647384900830003,375
Epsom and EwellCourt5,250Epsom and Ewell1,7451,7423560440003,887
Epsom and EwellCuddington4,466Epsom and Ewell1,9439173760710003,307
Epsom and EwellEwell4,263Epsom and Ewell1,81284038101240003,157
Epsom and EwellEwell Court4,169Epsom and Ewell1,8807533860690003,088
Epsom and EwellNonsuch4,144Epsom and Ewell1,9876503720600003,069
Epsom and EwellRuxley4,710Epsom and Ewell2,0241,0213740700003,489
Epsom and EwellStamford4,687Epsom and Ewell1,7878367520960003,471
Epsom and EwellStoneleigh3,636Epsom and Ewell1,7596172700460002,692
Epsom and EwellTown5,338Epsom and Ewell1,8401,24971901450003,953
Epsom and EwellWest Ewell4,966Epsom and Ewell2,0521,0724630910003,678
Epsom and EwellWoodcote4,394Epsom and Ewell1,97476137701410003,253
Mole ValleyAshtead Common3,177Epsom and Ewell1,4434773450880002,353
Mole ValleyAshtead Park3,111Epsom and Ewell1,5564702320460002,304
Mole ValleyAshtead Village4,611Epsom and Ewell2,25762238101560003,416
Reigate and BansteadNork5,806Epsom and Ewell3,0307314530870004,301
Reigate and BansteadTattenhams5,637Epsom and Ewell2,74283436602320004,174
 Total80,027 35,31314,8387,40101,71400059,266

The full details of these calculations are given on the Epsom and Ewell seat details page. Click on "Show workings".

New seat: Epsom and Ewell

The new seat of Epsom and Ewell is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Epsom and Ewell
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
Epsom and EwellAuriol2,959Epsom and Ewell1,4185083080650002,299
Epsom and EwellCollege4,162Epsom and Ewell2,0647384900830003,375
Epsom and EwellCourt4,567Epsom and Ewell1,7451,7423560440003,887
Epsom and EwellCuddington4,365Epsom and Ewell1,9439173760710003,307
Epsom and EwellEwell4,122Epsom and Ewell1,81284038101240003,157
Epsom and EwellEwell Court4,201Epsom and Ewell1,8807533860690003,088
Epsom and EwellNonsuch4,302Epsom and Ewell1,9876503720600003,069
Epsom and EwellRuxley4,301Epsom and Ewell2,0241,0213740700003,489
Epsom and EwellStamford4,944Epsom and Ewell1,7878367520960003,471
Epsom and EwellStoneleigh3,603Epsom and Ewell1,7596172700460002,692
Epsom and EwellTown4,468Epsom and Ewell1,8401,24971901450003,953
Epsom and EwellWest Ewell4,544Epsom and Ewell2,0521,0724630910003,678
Epsom and EwellWoodcote4,263Epsom and Ewell1,97476137701410003,253
Mole ValleyAshtead Common3,195Epsom and Ewell1,4434773450880002,353
Mole ValleyAshtead Park3,341Epsom and Ewell1,5564702320460002,304
Mole ValleyAshtead Village4,523Epsom and Ewell2,25762238101560003,416
Reigate and BansteadNork6,035Epsom and Ewell3,0307314530870004,301
Reigate and BansteadTattenhams5,522Epsom and Ewell2,74283436602320004,174
 Total77,417 35,31314,8387,40101,71400059,266

And these are the implied results for 2017 for the new seat of Epsom and Ewell.


© 2017 Martin Baxter
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