Reference

Methodology

How Jamaica Electoral Analytics structures election geography, handles turnout and vote data, and distinguishes formal electoral contests from analytical subdivisions.

Transparent by design
01

Data Sources

Electoral records displayed by the platform are derived from official Jamaican electoral records and are normalized into a consistent analytical structure.

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Official records

Results are based on official election records rather than polling, projections or partisan estimates.

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Normalized structure

Historical records are normalized so elections can be explored through a common dashboard interface.

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Coverage is disclosed

Missing records are treated as unavailable information, not automatically interpreted as zero.

02

Electoral Geography

The meaning of a geographic level depends on whether the election is parliamentary or local government.

National

Aggregated view across the election records available for the selected election type and period.

Constituency

The formal parliamentary contest unit in a General Election.

Electoral Division

The formal contest unit in Local Government elections. In General Election analysis it is an analytical subdivision rather than a parliamentary seat.

Cluster

A derived analytical grouping based on normalized polling-station location. Clusters are not persisted as formal electoral entities and are not assumed to have continuous historical identity.

Polling Division

The lowest geographic level exposed by the dashboard for detailed result exploration.

03

General vs Local Government

G

General Election

National → Constituency → Electoral Division → Cluster → Polling Division.

Constituency is the formal contest level. Lower levels are used analytically.

L

Local Government

National → Electoral Division → Cluster → Polling Division.

Electoral Division is the formal Local Government contest level.

04

Turnout

Headline turnout shows the actual turnout recorded for the election. Deeper historical analysis may use a standardized turnout measure to improve election-to-election comparability.

Actual turnout

The percentage of registered electors who cast a ballot, including EPM voting represented in the official result.

Comparable turnout

For deeper historical analysis, EPM-affected voting may be excluded so the platform can compare a more consistent standard voting base between elections.

Why EPM is treated separately

EPM voting can involve special-services electors and may occur in different locations from one election to another. Excluding that changing component from historical turnout comparisons helps prevent it from distorting the analytical story of the local area.

05

Vote Share and Margins

Vote share

A party's percentage of valid votes in the selected resolved geography.

Margin

The percentage-point difference between JLP and PNP vote share. The displayed value shows the size of the lead, while the party label and colour identify which party is ahead.

Other

Valid votes cast for candidates or parties outside the two principal party totals displayed separately by the dashboard.

06

Historical Comparison

A

Election A

Earlier election selected as the comparison baseline.

B

Election B

Later election against which changes are evaluated.

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Missing is not zero

If one election lacks usable coverage, the platform does not automatically infer a gain, loss, addition or removal.

Derived geography

Cluster and Polling Division geography is not treated as automatically continuous across different elections unless historical mapping supports that comparison.

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Interpretation and Limitations

Analytical ≠ formal

A General Election Electoral Division, Cluster or Polling Division is an analytical subdivision and must not be interpreted as a parliamentary seat.

Historical geography

Geographic names and structures can change over time. The platform avoids asserting continuity that is not supported by the source records.

Data availability

The absence of a record means the platform does not currently have usable data for that scope. It does not establish that the event or geography did not exist.