Down Mid: New Boundaries 2018 Calculation

Down Mid: Overview

 Projection: DUP seat 

Implied MP at 2017: Jim Shannon  (DUP)
County/Area: Down (Northern Ireland)
Electorate: 77,653
Turnout: 60.2%

 Implied 2017 VotesImplied 2017 Share
DUP27,16758.1%
UUP7,70416.5%
MIN6,41013.7%
SF2,3034.9%
SDLP2,1554.6%
OTH5971.3%
Green4100.9%
DUP Majority19,46341.6%

See overview of other seats in Northern Ireland.

Down Mid: 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 Down Mid 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 Down Mid

The old seat(s) needed are:

Old seat: Down South

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

Old seat: Down SouthTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatUUP
Votes
SDLP
Votes
DUP
Votes
UKIP
Votes
Green
Votes
SF
Votes
MIN
Votes
OTH
Votes
Total
Votes
Armagh, Banbridge and CraigavonBanbridge East775Down Mid629119700154160520
Armagh, Banbridge and CraigavonGransha689Down Mid43322560098350464
Armagh, Banbridge and CraigavonLoughbrickland992Down South8011825300197200668
Armagh, Banbridge and CraigavonRathfriland3,319Down South266393844006596702,229
Newry, Mourne and DownAbbey240Newry and Armagh254130076160161
Newry, Mourne and DownAnnalong2,863Down South95515426008612701,924
Newry, Mourne and DownBallydugan2,543Down South52457396007327301,710
Newry, Mourne and DownBallyward2,639Down South54474412007607501,775
Newry, Mourne and DownBinnian2,827Down South94509422008512601,902
Newry, Mourne and DownBurren2,742Down South51823141007596901,843
Newry, Mourne and DownCastlewellan3,032Down South62545474008738602,040
Newry, Mourne and DownCathedral2,831Down South32990137006548901,902
Newry, Mourne and DownCrossgar and Killyleagh1,194Down South6117632000189570803
Newry, Mourne and DownDamolly560Newry and Armagh51263100177370376
Newry, Mourne and DownDerryboy412Down Mid21611110065200278
Newry, Mourne and DownDerryleckagh3,084Down South58926161008547702,076
Newry, Mourne and DownDonard2,681Down South89482400008072501,803
Newry, Mourne and DownDrumaness2,823Down South57507441008138101,899
Newry, Mourne and DownDundrum2,920Down South59525456008418301,964
Newry, Mourne and DownHilltown3,381Down South631,015174009368502,273
Newry, Mourne and DownKilkeel2,708Down South90487404008152501,821
Newry, Mourne and DownKnocknashinna3,161Down South361,1061530073210002,127
Newry, Mourne and DownLecale2,870Down South321,004138006659101,930
Newry, Mourne and DownLisnacree3,291Down South109592491009913002,213
Newry, Mourne and DownMayobridge3,004Down South56901156008327502,020
Newry, Mourne and DownMurlough2,768Down South92497412008332601,860
Newry, Mourne and DownQuoile2,580Down South29902125005978201,735
Newry, Mourne and DownRostrevor3,226Down South60968167008938102,169
Newry, Mourne and DownSt Patrick's754Newry and Armagh61694200238500505
Newry, Mourne and DownStrangford2,655Down South30930128006148401,786
Newry, Mourne and DownTollymore2,772Down South92499412008342601,863
Newry, Mourne and DownWarrenpoint3,350Down South631,005173009268302,250
 Total75,686 2,00117,8798,8660020,3261,817050,889

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

Old seat: Lagan Valley

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

Old seat: Lagan ValleyTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatUUP
Votes
SDLP
Votes
DUP
Votes
UKIP
Votes
Green
Votes
SF
Votes
MIN
Votes
OTH
Votes
Total
Votes
Armagh, Banbridge and CraigavonDonaghcloney75Upper Bann133260025150
Armagh, Banbridge and CraigavonDromore3,215Down Mid5311061,0910050192261,996
Armagh, Banbridge and CraigavonGransha2,493Down Mid412828460038149201,547
Armagh, Banbridge and CraigavonQuilly2,989Down Mid495981,0130046178241,854
BelfastBelvoir265Belfast South1442640021193163
BelfastDunmurry908Belfast West209311900290375564
Lisburn and CastlereaghBallinderry2,566Antrim South2471918850016097131,593
Lisburn and CastlereaghBallymacash2,231Antrim South165115935000149201,384
Lisburn and CastlereaghBallymacbrennan2,064Down Mid21126843000178241,282
Lisburn and CastlereaghBallymacoss3,065Antrim South2261581,284000205281,901
Lisburn and CastlereaghBlaris2,177Antrim South31586760000168231,352
Lisburn and CastlereaghDerryaghy2,844Belfast West2321631,01500100223311,764
Lisburn and CastlereaghDromara2,386Down Mid24430973000205281,480
Lisburn and CastlereaghDrumbo2,077Belfast South21326848000178241,289
Lisburn and CastlereaghHarmony Hill2,205Antrim South1811277860077173241,368
Lisburn and CastlereaghHilden2,634Antrim South2151529400092207281,634
Lisburn and CastlereaghHillhall2,553Antrim South261321,041000220301,584
Lisburn and CastlereaghHillsborough2,234Down Mid32289779000172241,386
Lisburn and CastlereaghKnockmore2,735Antrim South2031411,146000183251,698
Lisburn and CastlereaghLagan2,172Antrim South31486758000168231,349
Lisburn and CastlereaghLagan Valley2,436Antrim South1801251,021000163221,511
Lisburn and CastlereaghLambeg2,416Belfast West1981398630085190261,501
Lisburn and CastlereaghLisnagarvey2,219Antrim South165114929000149201,377
Lisburn and CastlereaghMaghaberry2,914Antrim South2792171,00500183110151,809
Lisburn and CastlereaghMagheralave2,275Antrim South1851318130081178241,412
Lisburn and CastlereaghMaze2,064Antrim South29981721000160221,283
Lisburn and CastlereaghMoira2,679Antrim South387106935000207281,663
Lisburn and CastlereaghOld Warren2,865Antrim South2121481,202000192261,780
Lisburn and CastlereaghRavernet2,103Down Mid21527858000181251,306
Lisburn and CastlereaghStonyford344Antrim South33261180021132213
Lisburn and CastlereaghWallace Park2,847Antrim South2321631,01700100223311,766
Lisburn and CastlereaghWhite Mountain3,198Antrim South3062381,10200200121171,984
Newry, Mourne and DownBallyward132Down South8222700214183
 Total72,380 7,5333,38326,763001,5674,99768344,926

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

Old seat: Strangford

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

Old seat: StrangfordTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatUUP
Votes
SDLP
Votes
DUP
Votes
UKIP
Votes
Green
Votes
SF
Votes
MIN
Votes
OTH
Votes
Total
Votes
Lisburn and CastlereaghCarryduff East408Belfast South16411180423414247
Lisburn and CastlereaghKnockbracken178Belfast South717520210182108
Lisburn and CastlereaghMoneyreagh1,985Belfast South6308110940209191,196
Newry, Mourne and DownBallynahinch3,042Down Mid289254939024138174151,833
Newry, Mourne and DownCrossgar and Killyleagh1,884Down South17915758201585108101,136
Newry, Mourne and DownDerryboy2,488Down Mid237207768020113142131,500
Newry, Mourne and DownKilmore2,777Down Mid264231857022126159141,673
Newry, Mourne and DownSaintfield2,848Down Mid270237879023129162141,714
North Down and ArdsBallygowan2,942Down Mid23501,2100290274241,772
North Down and ArdsBallywalter3,120Down North1882621,20001896108101,882
North Down and ArdsCarrowdore2,061Down North123172793012637261,241
North Down and ArdsComber North2,691Down Mid21601,1070260250221,621
North Down and ArdsComber South2,551Down Mid20501,0490250237211,537
North Down and ArdsComber West2,619Down Mid21001,0770260243221,578
North Down and ArdsConway Square2,969Down Mid16401,1330280426381,789
North Down and ArdsCronstown3,193Down Mid17601,2190300457411,923
North Down and ArdsGlen2,976Down Mid16401,1360280427381,793
North Down and ArdsGregstown2,454Down Mid13509370230352311,478
North Down and ArdsKillinchy2,425Down Mid19509970240225201,461
North Down and ArdsKircubbin3,001Down North1802511,1540179110491,806
North Down and ArdsLoughries1,408Down North841185420843484847
North Down and ArdsMovilla3,054Down Mid16901,1660280438391,840
North Down and ArdsPortaferry2,653Down North1602221,020015819281,598
North Down and ArdsPortavogie2,799Down North1682351,076016869791,687
North Down and ArdsScrabo2,688Down Mid14801,0270250385341,619
North Down and ArdsWest Winds3,116Down Mid17201,1900290447401,878
 Total64,330 4,4172,40424,03906111,0845,69550738,757

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

Old seat: Upper Bann

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

Old seat: Upper BannTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatUUP
Votes
SDLP
Votes
DUP
Votes
UKIP
Votes
Green
Votes
SF
Votes
MIN
Votes
OTH
Votes
Total
Votes
Armagh, Banbridge and CraigavonAghagallon3,289Upper Bann246298592009551202,103
Armagh, Banbridge and CraigavonBallybay3,068Upper Bann231901,0780043213001,961
Armagh, Banbridge and CraigavonBanbridge East2,172Down Mid346106639002455201,388
Armagh, Banbridge and CraigavonBanbridge North2,885Down Mid459141849003266901,844
Armagh, Banbridge and CraigavonBanbridge South3,166Down Mid504155931003577602,023
Armagh, Banbridge and CraigavonBanbridge West3,704Down Mid5901821,090004188902,369
Armagh, Banbridge and CraigavonBleary3,054Upper Bann2571568750053113401,953
Armagh, Banbridge and CraigavonBrownlow4,257Upper Bann3582181,2190073918702,721
Armagh, Banbridge and CraigavonCorcrain3,548Upper Bann2671051,2460049915102,268
Armagh, Banbridge and CraigavonCraigavon Centre3,710Upper Bann3121901,0620064416402,372
Armagh, Banbridge and CraigavonDerrytrasna3,179Upper Bann2671639100055214002,032
Armagh, Banbridge and CraigavonDonaghcloney2,959Upper Bann361381,1610015517801,893
Armagh, Banbridge and CraigavonGilford3,251Upper Bann518159957003677802,079
Armagh, Banbridge and CraigavonKernan3,233Upper Bann2721659250056114202,065
Armagh, Banbridge and CraigavonKillycomain3,016Upper Bann227891,0600042412801,928
Armagh, Banbridge and CraigavonKnocknashane2,836Upper Bann212257510008231001,812
Armagh, Banbridge and CraigavonLough Road3,334Upper Bann250303600009691202,134
Armagh, Banbridge and CraigavonLoughbrickland1,741Down South27785512001964201,112
Armagh, Banbridge and CraigavonMagheralin2,952Upper Bann221268530008581101,888
Armagh, Banbridge and CraigavonMahon3,151Upper Bann237931,1070044413402,015
Armagh, Banbridge and CraigavonMourneview3,375Upper Bann253306607009801202,158
Armagh, Banbridge and CraigavonParklake3,558Upper Bann267323639001,0341302,276
Armagh, Banbridge and CraigavonShankill4,072Upper Bann306369731001,1831402,603
Armagh, Banbridge and CraigavonThe Birches3,206Upper Bann241941,1260045213602,049
Armagh, Banbridge and CraigavonWaringstown3,452Upper Bann420441,3540018120702,206
 Total80,168 7,8994,39722,3100014,3252,321051,252

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

New seat: Down Mid

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

New seat: Down Mid
DistrictWardElectorate
2017
Old Seat UUP
Votes
SDLP
Votes
DUP
Votes
UKIP
Votes
Green
Votes
SF
Votes
MIN
Votes
OTH
Votes
Total
Votes
Armagh, Banbridge and CraigavonBanbridge East827Down South1075222000105180502
Armagh, Banbridge and CraigavonBanbridge East2,322Upper Bann301145616002945001,406
Armagh, Banbridge and CraigavonBanbridge North3,127Upper Bann459141849003266901,844
Armagh, Banbridge and CraigavonBanbridge South3,309Upper Bann504155931003577602,023
Armagh, Banbridge and CraigavonBanbridge West3,621Upper Bann5901821,090004188902,369
Armagh, Banbridge and CraigavonDromore3,136Lagan Valley5311061,0910050192261,996
Armagh, Banbridge and CraigavonGransha721Down South99252400030404438
Armagh, Banbridge and CraigavonGransha2,583Lagan Valley3568986200106144161,573
Armagh, Banbridge and CraigavonQuilly3,026Lagan Valley495981,0130046178241,854
Lisburn and CastlereaghBallymacbrennan2,304Lagan Valley21126843000178241,282
Lisburn and CastlereaghDromara2,451Lagan Valley24430973000205281,480
Lisburn and CastlereaghHillsborough2,557Lagan Valley32289779000172241,386
Lisburn and CastlereaghRavernet2,268Lagan Valley21527858000181251,306
Newry, Mourne and DownBallynahinch2,871Strangford289254939024138174151,833
Newry, Mourne and DownDerryboy414Down South37381250325232253
Newry, Mourne and DownDerryboy2,496Strangford221230754017153139111,525
Newry, Mourne and DownKilmore2,805Strangford264231857022126159141,673
Newry, Mourne and DownSaintfield2,993Strangford270237879023129162141,714
North Down and ArdsBallygowan3,050Strangford23501,2100290274241,772
North Down and ArdsComber North2,726Strangford21601,1070260250221,621
North Down and ArdsComber South2,738Strangford20501,0490250237211,537
North Down and ArdsComber West2,669Strangford21001,0770260243221,578
North Down and ArdsConway Square2,873Strangford16401,1330280426381,789
North Down and ArdsCronstown3,184Strangford17601,2190300457411,923
North Down and ArdsGlen3,043Strangford16401,1360280427381,793
North Down and ArdsGregstown2,526Strangford13509370230352311,478
North Down and ArdsKillinchy2,579Strangford19509970240225201,461
North Down and ArdsMovilla2,538Strangford16901,1660280438391,840
North Down and ArdsScrabo3,065Strangford14801,0270250385341,619
North Down and ArdsWest Winds2,831Strangford17201,1900290447401,878
 Total77,653 7,7042,15527,16704102,3036,41059746,746

And these are the implied results for 2017 for the new seat of Down Mid.


© 2018 Electoral Calculus Ltd
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