Brentwood and Ongar: New Boundaries 2018 Calculation

Brentwood and Ongar: Overview

 Projection: CON seat 

Implied MP at 2017: Alex Burghart  (CON)
County/Area: Essex (Anglia)
Electorate: 75,442
Turnout: 73.7%

 Implied 2017 VotesImplied 2017 Share
CON36,04264.8%
LAB11,57420.8%
LIB4,9568.9%
UKIP2,1823.9%
Green7301.3%
OTH1010.2%
CON Majority24,46844.0%

See overview of other seats in Anglia.

Brentwood and Ongar : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Brentwood and Ongar constituency, the 'Anglia' 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.

IndicatorSeatAngliaAll GB
Party WinnerCONCONCON
Economic Position15° Right8° Right
National Position14° Nat10° Nat1° Int
EU Leave %60%57%52%
British Identity37%27%29%
Good Health54%47%48%
UK Born63%89%88%
Good Education58%37%39%
Good Job70%53%51%
High SEC65%53%51%
Average Age44.249.448.5
ABC1 Class72%55%53%

Brentwood and Ongar ranks #153 for "Leave", #39 for "Right" and #49 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

Brentwood and Ongar: 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 Brentwood and Ongar 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 Brentwood and Ongar

The old seat(s) needed are:

Old seat: Brentwood and Ongar

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

Old seat: Brentwood and OngarTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BrentwoodBrentwood North5,177Brentwood and Ongar1,8651,0055661109700133,656
BrentwoodBrentwood South4,668Brentwood and Ongar1,7081,187242104530023,296
BrentwoodBrentwood West5,706Brentwood and Ongar2,49096249320600054,030
BrentwoodBrizes and Doddinghurst4,766Brentwood and Ongar2,384551223164430013,366
BrentwoodHerongate, Ingrave and West Horndon2,986Brentwood and Ongar1,4904276697210082,109
BrentwoodHutton Central3,070Brentwood and Ongar1,55739316126230092,169
BrentwoodHutton East2,961Brentwood and Ongar1,37548112494160012,091
BrentwoodHutton North3,414Brentwood and Ongar1,598597154242600112,410
BrentwoodHutton South3,109Brentwood and Ongar1,60142774661600122,196
BrentwoodIngatestone, Fryerning and Mountnessing4,805Brentwood and Ongar2,463579210108320023,394
BrentwoodPilgrims Hatch4,796Brentwood and Ongar1,767793598179480023,387
BrentwoodShenfield4,377Brentwood and Ongar2,24541834553240063,091
BrentwoodSouth Weald1,554Brentwood and Ongar79020220502400101,096
BrentwoodTipps Cross3,087Brentwood and Ongar1,5894007594140082,180
BrentwoodWarley4,809Brentwood and Ongar2,04278246171400013,397
Epping ForestChipping Ongar, Greensted and Marden Ash3,260Brentwood and Ongar1,5192722431491180012,302
Epping ForestHastingwood, Matching and Sheering Village169Harlow8030423001120
Epping ForestHigh Ongar, Willingale and The Rodings1,817Brentwood and Ongar9871693932500061,283
Epping ForestLambourne1,620Brentwood and Ongar895131169380011,144
Epping ForestMoreton and Fyfield1,561Harlow8511096226550001,103
Epping ForestNorth Weald Bassett3,605Harlow1,7143791531751250012,547
Epping ForestPassingford1,833Brentwood and Ongar1,0781136031100021,294
Epping ForestShelley1,764Brentwood and Ongar723403377770001,247
 Total74,914 34,81110,8104,4261,8459130010352,908

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

Old seat: Saffron Walden

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

Old seat: Saffron WaldenTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
ChelmsfordBoreham and The Leighs5,185Witham and Maldon2,5325536018700003,773
ChelmsfordBroomfield and The Walthams6,599Brentwood and Ongar2,6941,03957649500004,804
ChelmsfordChelmsford Rural West2,259Brentwood and Ongar1,1822431734500001,643
ChelmsfordWrittle4,430Billericay1,87742773718200003,223
UttlesfordAshdon1,620Saffron Walden802272555000001,179
UttlesfordBroad Oak and the Hallingburys3,267Saffron Walden1,64135019019600002,377
UttlesfordClavering1,785Saffron Walden9591681591400001,300
UttlesfordDebden and Wimbish1,980Saffron Walden1,044246143800001,441
UttlesfordElsenham and Henham2,964Saffron Walden1,0873766484600002,157
UttlesfordFelsted and Stebbing3,574Saffron Walden1,68648023520000002,601
UttlesfordFlitch Green and Little Dunmow2,050Saffron Walden1,0642801024600001,492
UttlesfordGreat Dunmow North3,200Saffron Walden1,5065791578700002,329
UttlesfordGreat Dunmow South and Barnston4,823Saffron Walden2,2768423009200003,510
UttlesfordHatfield Heath1,805Saffron Walden959251792500001,314
UttlesfordHigh Easter and The Rodings1,874Saffron Walden1,0451681252600001,364
UttlesfordLittlebury, Chesterford and Wenden Lofts3,452Saffron Walden1,638714151900002,512
UttlesfordNewport2,839Saffron Walden1,2954902493200002,066
UttlesfordSaffron Walden Audley3,789Saffron Walden1,4637725071700002,759
UttlesfordSaffron Walden Castle3,192Saffron Walden1,1548202915900002,324
UttlesfordSaffron Walden Shire5,563Saffron Walden2,2171,2585324200004,049
UttlesfordStansted North3,385Saffron Walden1,2874537091500002,464
UttlesfordStansted South and Birchanger2,838Saffron Walden1,0854864336200002,066
UttlesfordStort Valley1,639Saffron Walden689134364500001,192
UttlesfordTakeley4,021Saffron Walden1,89762520320100002,926
UttlesfordThaxted and the Eastons3,764Saffron Walden1,6124116744300002,740
UttlesfordThe Sampfords1,792Saffron Walden938226133500001,302
 Total83,689 37,62912,6638,5262,089000060,907

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

New seat: Brentwood and Ongar

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

New seat: Brentwood and Ongar
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
BrentwoodBrentwood North5,054Brentwood and Ongar1,8651,0055661109700133,656
BrentwoodBrentwood South4,204Brentwood and Ongar1,7081,187242104530023,296
BrentwoodBrentwood West5,096Brentwood and Ongar2,49096249320600054,030
BrentwoodBrizes and Doddinghurst4,648Brentwood and Ongar2,384551223164430013,366
BrentwoodHerongate, Ingrave and West Horndon2,970Brentwood and Ongar1,4904276697210082,109
BrentwoodHutton Central2,950Brentwood and Ongar1,55739316126230092,169
BrentwoodHutton East2,873Brentwood and Ongar1,37548112494160012,091
BrentwoodHutton North3,085Brentwood and Ongar1,598597154242600112,410
BrentwoodHutton South3,029Brentwood and Ongar1,60142774661600122,196
BrentwoodIngatestone, Fryerning and Mountnessing4,795Brentwood and Ongar2,463579210108320023,394
BrentwoodPilgrims Hatch4,497Brentwood and Ongar1,767793598179480023,387
BrentwoodShenfield4,187Brentwood and Ongar2,24541834553240063,091
BrentwoodSouth Weald1,437Brentwood and Ongar79020220502400101,096
BrentwoodTipps Cross3,115Brentwood and Ongar1,5894007594140082,180
BrentwoodWarley4,505Brentwood and Ongar2,04278246171400013,397
ChelmsfordBroomfield and The Walthams6,367Saffron Walden2,6941,03957649500004,804
ChelmsfordChelmsford Rural West2,181Saffron Walden1,1822431734500001,643
Epping ForestChipping Ongar, Greensted and Marden Ash3,435Brentwood and Ongar1,5192722431491180012,302
Epping ForestHigh Ongar, Willingale and The Rodings1,832Brentwood and Ongar9871693932500061,283
Epping ForestLambourne1,561Brentwood and Ongar895131169380011,144
Epping ForestPassingford1,884Brentwood and Ongar1,0781136031100021,294
Epping ForestShelley1,737Brentwood and Ongar723403377770001,247
 Total75,442 36,04211,5744,9562,1827300010155,585

And these are the implied results for 2017 for the new seat of Brentwood and Ongar.


© 2017 Martin Baxter
Powered by TigerLib (11-Sep-2017 15:41)