Orkney and Shetland: New Boundaries 2018 Calculation

Orkney and Shetland: Overview

 Projection: LIB seat 

Implied MP at 2017: Alistair Carmichael  (LIB)
County/Area: Orkney and Shetland (Scotland)
Electorate: 33,228
Turnout: 70.1%

 Implied 2017 VotesImplied 2017 Share
LIB11,31148.6%
SNP6,75029.0%
LAB2,66511.4%
CON2,0248.7%
UKIP2831.2%
OTH2451.1%
LIB Majority4,56119.6%

See overview of other seats in Scotland.

Orkney and Shetland : Political and Demographic indicators

The table below shows some political and demographic numerical indicators for the new Orkney and Shetland constituency, the 'Scotland' 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.

IndicatorSeatScotlandAll GB
Party WinnerLIBSNPCON
Economic Position9° Left14° Left
National Position17° Int17° Int1° Int
EU Leave %40%38%52%
British Identity27%27%29%
Good Health44%52%48%
UK Born85%93%88%
Good Education31%36%39%
Good Job41%49%51%
High SEC36%55%51%
Average Age45.048.748.5
ABC1 Class40%50%53%

Orkney and Shetland ranks #511 for "Leave", #485 for "Right" and #510 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

Orkney and Shetland: 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 Orkney and Shetland 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 Orkney and Shetland

The old seat(s) needed are:

Old seat: Orkney and Shetland

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

Old seat: Orkney and ShetlandTransfer-adjusted Results
DistrictWardElectorate
2017
New SeatCON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
SNP
Votes
MIN
Votes
OTH
Votes
Total
Votes
Orkney IslandsEast Mainland, South Ronaldsay and Burray2,507Orkney and Shetland1891208352005260181,708
Orkney IslandsKirkwall East3,423Orkney and Shetland1913211,0511707300242,334
Orkney IslandsKirkwall West and Orphir3,241Orkney and Shetland2091821,0791806940262,208
Orkney IslandsNorth Isles1,754Orkney and Shetland202775652003210111,196
Orkney IslandsStromness and South Isles2,184Orkney and Shetland2451026232204770191,488
Orkney IslandsWest Mainland3,274Orkney and Shetland2031861,1552306410222,230
Shetland IslandsLerwick North2,489Orkney and Shetland882378401704940191,695
Shetland IslandsLerwick South3,595Orkney and Shetland1404251,1253007030262,449
Shetland IslandsNorth Isles2,152Orkney and Shetland1471577282403970131,466
Shetland IslandsShetland Central2,268Orkney and Shetland752097841604450161,545
Shetland IslandsShetland North2,527Orkney and Shetland1592138022805030181,723
Shetland IslandsShetland South2,679Orkney and Shetland1032549652804550191,824
Shetland IslandsShetland West2,071Orkney and Shetland731827592003640141,412
 Total34,164 2,0242,66511,31128306,750024523,278

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

New seat: Orkney and Shetland

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

New seat: Orkney and Shetland
DistrictWardElectorate
2017
Old Seat CON
Votes
LAB
Votes
LIB
Votes
UKIP
Votes
Green
Votes
SNP
Votes
MIN
Votes
OTH
Votes
Total
Votes
Orkney IslandsEast Mainland, South Ronaldsay and Burray2,493Orkney and Shetland1891208352005260181,708
Orkney IslandsKirkwall East3,404Orkney and Shetland1913211,0511707300242,334
Orkney IslandsKirkwall West and Orphir3,223Orkney and Shetland2091821,0791806940262,208
Orkney IslandsNorth Isles1,744Orkney and Shetland202775652003210111,196
Orkney IslandsStromness and South Isles2,172Orkney and Shetland2451026232204770191,488
Orkney IslandsWest Mainland3,256Orkney and Shetland2031861,1552306410222,230
Shetland IslandsLerwick North2,371Orkney and Shetland882378401704940191,695
Shetland IslandsLerwick South3,424Orkney and Shetland1404251,1253007030262,449
Shetland IslandsNorth Isles2,050Orkney and Shetland1471577282403970131,466
Shetland IslandsShetland Central2,160Orkney and Shetland752097841604450161,545
Shetland IslandsShetland North2,407Orkney and Shetland1592138022805030181,723
Shetland IslandsShetland South2,552Orkney and Shetland1032549652804550191,824
Shetland IslandsShetland West1,972Orkney and Shetland731827592003640141,412
 Total33,228 2,0242,66511,31128306,750024523,278

And these are the implied results for 2017 for the new seat of Orkney and Shetland.


© 2017 Martin Baxter
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