Corby and Northamptonshire East: New Boundaries 2018 Calculation

Corby and Northamptonshire East: Overview

 Projection: CON seat 

Implied MP at 2017: Tom Pursglove  (CON)
County/Area: Northamptonshire (East Midlands)
Electorate: 73,718
Turnout: 75.1%

 Implied 2017 VotesImplied 2017 Share
CON26,94248.7%
LAB25,01845.2%
LIB1,4962.7%
UKIP1,3322.4%
Green5531.0%
CON Majority1,9243.5%

See overview of other seats in East Midlands.

Corby and Northamptonshire East : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Corby and Northamptonshire East constituency, the 'East Midlands' 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.

IndicatorSeatEast MidlandsAll GB
Party WinnerCONCONCON
Economic Position1° Right3° Right
National Position9° Nat9° Nat1° Int
EU Leave %60%59%52%
British Identity39%27%29%
Good Health54%45%48%
UK Born60%91%88%
Good Education59%36%39%
Good Job70%48%51%
High SEC58%47%51%
Average Age39.149.148.5
ABC1 Class66%50%53%

Corby and Northamptonshire East ranks #150 for "Leave", #300 for "Right" and #152 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

Corby and Northamptonshire East: 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 Corby and Northamptonshire East 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 Corby and Northamptonshire East

The old seat(s) needed are:

Old seat: Corby

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

Old seat: CorbyTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
CorbyBeanfield5,424Corby and Northamptonshire East1,1112,6419979160003,946
CorbyCentral3,465Corby and Northamptonshire East6971,761273520002,522
CorbyDanesholme3,092Corby and Northamptonshire East8381,042251109100002,250
CorbyKingswood and Hazel Leys5,104Corby and Northamptonshire East9802,427311251500003,713
CorbyLloyds5,294Corby and Northamptonshire East1,1052,649395190003,853
CorbyLodge Park5,128Corby and Northamptonshire East1,1932,34555123150003,731
CorbyOakley North2,843Corby and Northamptonshire East8861,0076399140002,069
CorbyOakley South5,866Corby and Northamptonshire East2,0812,113255170004,268
CorbyRowlett3,972Corby and Northamptonshire East7981,9493092210002,890
CorbyRural West1,274Corby and Northamptonshire East5193475353000927
CorbyStanion and Corby Village1,861Corby and Northamptonshire East62267054790001,353
CorbyWeldon and Gretton2,550Corby and Northamptonshire East1,0466409034460001,856
East NorthamptonshireBarnwell1,481Corby and Northamptonshire East810113146190001,079
East NorthamptonshireFineshade1,534Corby and Northamptonshire East842230193220001,116
East NorthamptonshireIrthlingborough John Pyel3,436Wellingborough1,3271,01327120130002,500
East NorthamptonshireIrthlingborough Waterloo2,956Wellingborough1,2648132042130002,152
East NorthamptonshireKing's Forest1,422Corby and Northamptonshire East6572361271140001,035
East NorthamptonshireLower Nene1,606Corby and Northamptonshire East946149452170001,168
East NorthamptonshireLyveden1,522Corby and Northamptonshire East90317089180001,108
East NorthamptonshireOundle4,721Corby and Northamptonshire East2,1931,00214146550003,437
East NorthamptonshirePrebendal1,603Corby and Northamptonshire East842229811130001,166
East NorthamptonshireRaunds Saxon3,337Corby and Northamptonshire East1,515812366060002,429
East NorthamptonshireRaunds Windmill3,129Corby and Northamptonshire East1,26079142166170002,276
East NorthamptonshireStanwick1,638Corby and Northamptonshire East82626989710001,192
East NorthamptonshireThrapston Lakes3,550Corby and Northamptonshire East1,9065702941380002,584
East NorthamptonshireThrapston Market3,050Corby and Northamptonshire East1,5985002573250002,221
East NorthamptonshireWoodford1,583Corby and Northamptonshire East76835641860001,152
 Total82,441 29,53326,8441,5431,49457900059,993

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

New seat: Corby and Northamptonshire East

The new seat of Corby and Northamptonshire East is made up of the following wards, with the transfer-adjusted votes shown.

New seat: Corby and Northamptonshire East
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
CorbyBeanfield5,043Corby1,1112,6419979160003,946
CorbyCentral3,092Corby6971,761273520002,522
CorbyDanesholme3,079Corby8381,042251109100002,250
CorbyKingswood and Hazel Leys4,230Corby9802,427311251500003,713
CorbyLloyds4,645Corby1,1052,649395190003,853
CorbyLodge Park4,969Corby1,1932,34555123150003,731
CorbyOakley North2,600Corby8861,0076399140002,069
CorbyOakley South4,872Corby2,0812,113255170004,268
CorbyRowlett3,596Corby7981,9493092210002,890
CorbyRural West1,439Corby5193475353000927
CorbyStanion and Corby Village2,550Corby62267054790001,353
CorbyWeldon and Gretton3,166Corby1,0466409034460001,856
East NorthamptonshireBarnwell1,568Corby810113146190001,079
East NorthamptonshireFineshade1,626Corby842230193220001,116
East NorthamptonshireKing's Forest1,710Corby6572361271140001,035
East NorthamptonshireLower Nene1,613Corby946149452170001,168
East NorthamptonshireLyveden1,573Corby90317089180001,108
East NorthamptonshireOundle4,540Corby2,1931,00214146550003,437
East NorthamptonshirePrebendal1,736Corby842229811130001,166
East NorthamptonshireRaunds Saxon3,328Corby1,515812366060002,429
East NorthamptonshireRaunds Windmill3,026Corby1,26079142166170002,276
East NorthamptonshireStanwick1,675Corby82626989710001,192
East NorthamptonshireThrapston Lakes3,372Corby1,9065702941380002,584
East NorthamptonshireThrapston Market2,999Corby1,5985002573250002,221
East NorthamptonshireWoodford1,671Corby76835641860001,152
 Total73,718 26,94225,0181,4961,33255300055,341

And these are the implied results for 2017 for the new seat of Corby and Northamptonshire East.


© 2017 Martin Baxter
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