Somerset North: New Boundaries 2018 Calculation

Somerset North: Overview

 Projection: CON seat 

Implied MP at 2017: Liam Fox  (CON)
County/Area: Bristol area (South West)
Electorate: 75,979
Turnout: 81.6%

 Implied 2017 VotesImplied 2017 Share
CON33,60554.2%
LAB16,50426.6%
LIB5,9839.7%
MIN3,9286.3%
Green1,9753.2%
CON Majority17,10127.6%

See overview of other seats in South West.

Somerset North : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Somerset North constituency, the 'South West' 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 WestAll GB
Party WinnerCONCONCON
Economic Position3° Right1° Right
National Position1° Int1° Nat1° Int
EU Leave %46%53%52%
British Identity27%27%29%
Good Health47%47%48%
UK Born95%92%88%
Good Education37%40%39%
Good Job47%50%51%
High SEC49%52%51%
Average Age50.850.548.5
ABC1 Class48%54%53%

Somerset North ranks #440 for "Leave", #272 for "Right" and #401 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

Somerset North: 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 Somerset North 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 Somerset North

The old seat(s) needed are:

Old seat: Somerset North

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

Old seat: Somerset NorthTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
North SomersetBackwell3,714Somerset North1,83143744906008302,860
North SomersetClevedon East3,518Somerset North1,168985264070022202,709
North SomersetClevedon South3,606Somerset North1,42688833104708302,775
North SomersetClevedon Walton3,440Somerset North1,586650140066020602,648
North SomersetClevedon West3,255Somerset North1,160934160073017902,506
North SomersetClevedon Yeo3,597Somerset North1,52080432903208402,769
North SomersetGordano Valley3,357Somerset North1,572695152044012102,584
North SomersetLong Ashton6,847Somerset North2,9171,2534460499015505,270
North SomersetNailsea Golden Valley3,443Somerset North1,360709163078034002,650
North SomersetNailsea West End3,100Somerset North1,298651119055026402,387
North SomersetNailsea Yeo3,396Somerset North1,372808140051024302,614
North SomersetNailsea Youngwood2,874Somerset North1,307525115057020902,213
North SomersetPill3,541Somerset North1,0941,064113076037902,726
North SomersetPortishead East4,876Somerset North2,126978418064016703,753
North SomersetPortishead North3,947Somerset North1,652816332070016703,037
North SomersetPortishead South3,241Somerset North1,36270432402508002,495
North SomersetPortishead West7,256Somerset North3,1731,330680085031705,585
North SomersetWinford3,346Somerset North1,66350279078025302,575
North SomersetWrington3,322Somerset North1,41654046905507602,556
North SomersetYatton6,863Somerset North2,6021,2317600390030005,283
 Total80,539 33,60516,5045,98301,97503,928061,995

The full details of these calculations are given on the Somerset North seat details page. Click on "Show workings".

New seat: Somerset North

The new seat of Somerset North is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Somerset North
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
North SomersetBackwell3,514Somerset North1,83143744906008302,860
North SomersetClevedon East3,153Somerset North1,168985264070022202,709
North SomersetClevedon South3,218Somerset North1,42688833104708302,775
North SomersetClevedon Walton3,346Somerset North1,586650140066020602,648
North SomersetClevedon West3,091Somerset North1,160934160073017902,506
North SomersetClevedon Yeo3,156Somerset North1,52080432903208402,769
North SomersetGordano Valley3,370Somerset North1,572695152044012102,584
North SomersetLong Ashton6,267Somerset North2,9171,2534460499015505,270
North SomersetNailsea Golden Valley3,330Somerset North1,360709163078034002,650
North SomersetNailsea West End2,931Somerset North1,298651119055026402,387
North SomersetNailsea Yeo3,226Somerset North1,372808140051024302,614
North SomersetNailsea Youngwood2,757Somerset North1,307525115057020902,213
North SomersetPill3,255Somerset North1,0941,064113076037902,726
North SomersetPortishead East4,926Somerset North2,126978418064016703,753
North SomersetPortishead North3,659Somerset North1,652816332070016703,037
North SomersetPortishead South3,191Somerset North1,36270432402508002,495
North SomersetPortishead West6,948Somerset North3,1731,330680085031705,585
North SomersetWinford3,239Somerset North1,66350279078025302,575
North SomersetWrington3,096Somerset North1,41654046905507602,556
North SomersetYatton6,306Somerset North2,6021,2317600390030005,283
 Total75,979 33,60516,5045,98301,97503,928061,995

And these are the implied results for 2017 for the new seat of Somerset North.


© 2017 Martin Baxter
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