Chesterfield: New Boundaries 2018 Calculation

Chesterfield: Overview

Projection: LAB seat

Implied MP at 2017:Toby Perkins  (LAB)
County/Area:Derbyshire (East Midlands)
Electorate:76,689
Turnout:66.7%

PartyImplied 2017 VotesImplied 2017 Share
LAB27,65454.1%
CON17,98635.2%
LIB2,8545.6%
UKIP1,8323.6%
Green8341.6%
LAB Majority9,66818.9%

See overview of other seats in East Midlands.



Introduction

This page shows the detail of the calculations performed to estimate the general election result for 2017 had the new boundaries for Chesterfield 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.

Chesterfield: Map

Boundary Lines courtesy of Ordnance Survey OpenData © Crown copyright 2015, Map © OpenStreetMap contributors

List of old seats forming part of Chesterfield

The old seat(s) needed are:

Old seat: Chesterfield

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

Old seat: ChesterfieldTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
ChesterfieldBrimington North2,956Chesterfield6211,34811048320002,159
ChesterfieldBrimington South4,827Chesterfield1,0691,73816766440003,084
ChesterfieldBrockwell4,936Chesterfield1,2031,539212151590003,164
ChesterfieldDunston4,664Chesterfield9671,876161160500003,214
ChesterfieldHasland5,004Chesterfield1,1471,86920772530003,348
ChesterfieldHollingwood and Inkersall5,885Chesterfield1,2632,39115489540003,951
ChesterfieldHolmebrook3,142Chesterfield7261,32113547420002,271
ChesterfieldLinacre3,255Chesterfield895894136125370002,087
ChesterfieldLoundsley Green2,963Chesterfield6391,18211545320002,013
ChesterfieldMiddlecroft and Poolsbrook3,433Chesterfield6761,6639649350002,519
ChesterfieldMoor3,234Chesterfield7551,29513452390002,275
ChesterfieldOld Whittington3,133Chesterfield7031,20497119350002,158
ChesterfieldRother4,656Chesterfield8732,086120159470003,285
ChesterfieldSt Helen's3,440Chesterfield7161,369107117380002,347
ChesterfieldSt Leonard's6,011Chesterfield1,3592,22924679700003,983
ChesterfieldWalton4,720Chesterfield1,4741,17120962540002,970
ChesterfieldWest5,038Chesterfield1,5731,089205171570003,095
 Total71,297 16,65926,2642,6111,61177800047,923

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

Old seat: Derbyshire North East

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

Old seat: Derbyshire North EastTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
ChesterfieldBarrow Hill and New Whittington4,378Chesterfield1,3271,390243221560003,237
ChesterfieldLowgates and Woodthorpe3,353Bolsover9391,4855554330002,566
North East DerbyshireAshover1,563Derbyshire North East7742191517120001,037
North East DerbyshireBarlow and Holmesfield1,553Derbyshire North East7142541955150001,057
North East DerbyshireBrampton and Walton2,998Derbyshire North East1,4404234396270002,029
North East DerbyshireClay Cross North4,579Derbyshire North East1,2991,59874169450003,185
North East DerbyshireClay Cross South2,818Derbyshire North East7431,2394941290002,101
North East DerbyshireCoal Aston2,699Derbyshire North East1,1025604988300001,829
North East DerbyshireDronfield North3,189Derbyshire North East1,1279976445360002,269
North East DerbyshireDronfield South4,149Derbyshire North East1,7331,0099258480002,940
North East DerbyshireDronfield Woodhouse2,797Derbyshire North East1,2705495737310001,944
North East DerbyshireEckington North2,810Derbyshire North East85193457124300001,996
North East DerbyshireEckington South2,802Derbyshire North East8011,1814044260002,092
North East DerbyshireGosforth Valley4,133Derbyshire North East1,7208898752430002,791
North East DerbyshireGrassmoor3,074Derbyshire North East7491,18945115280002,126
North East DerbyshireKillamarsh East2,959Derbyshire North East9081,0704144270002,090
North East DerbyshireKillamarsh West4,286Derbyshire North East1,2101,7268567430003,131
North East DerbyshireNorth Wingfield Central4,290Derbyshire North East1,3011,7126268400003,183
North East DerbyshireRenishaw1,916Derbyshire North East6587563529170001,495
North East DerbyshireRidgeway and Marsh Lane1,369Derbyshire North East5514092017130001,010
North East DerbyshireTupton2,972Derbyshire North East9071,1585445290002,193
North East DerbyshireUnstone1,449Derbyshire North East5314472521160001,040
North East DerbyshireWingerworth4,504Derbyshire North East2,1317287859440003,040
 Total70,640 24,78621,9221,3891,56671800050,381

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

New seat: Chesterfield

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

New seat: Chesterfield
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
NAT
Votes
MIN
Votes
OTH
Votes
Total
Votes
ChesterfieldBarrow Hill and New Whittington4,630Derbyshire North East1,3271,390243221560003,237
ChesterfieldBrimington North3,245Chesterfield6211,34811048320002,159
ChesterfieldBrimington South4,637Chesterfield1,0691,73816766440003,084
ChesterfieldBrockwell4,759Chesterfield1,2031,539212151590003,164
ChesterfieldDunston4,830Chesterfield9671,876161160500003,214
ChesterfieldHasland5,036Chesterfield1,1471,86920772530003,348
ChesterfieldHollingwood and Inkersall5,941Chesterfield1,2632,39115489540003,951
ChesterfieldHolmebrook3,415Chesterfield7261,32113547420002,271
ChesterfieldLinacre3,139Chesterfield895894136125370002,087
ChesterfieldLoundsley Green3,027Chesterfield6391,18211545320002,013
ChesterfieldMiddlecroft and Poolsbrook3,787Chesterfield6761,6639649350002,519
ChesterfieldMoor3,421Chesterfield7551,29513452390002,275
ChesterfieldOld Whittington3,244Chesterfield7031,20497119350002,158
ChesterfieldRother4,939Chesterfield8732,086120159470003,285
ChesterfieldSt Helen's3,530Chesterfield7161,369107117380002,347
ChesterfieldSt Leonard's5,989Chesterfield1,3592,22924679700003,983
ChesterfieldWalton4,465Chesterfield1,4741,17120962540002,970
ChesterfieldWest4,655Chesterfield1,5731,089205171570003,095
 Total76,689 17,98627,6542,8541,83283400051,160

And these are the implied results for 2017 for the new seat of Chesterfield. Please note that the wards used are those of 2015 in order to be consistent with those used by the Boundary Commissions.


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