A CSO Frontier Series Output- What is this?
The Staying Local Indicator (SLI) provides daily estimated percentages of county populations that have stayed within 10km of home, averaged over the preceding seven days.
The SLI is premised on the assumption that mobility patterns extracted from the anonymised data of Three Ireland mobile users are broadly representative of the wider population.
The Staying Local Indicator is based on statistical analysis of anonymised, aggregated, mobile phone activity records. Data from Three Ireland is collated from anonymised data sets at a macro scale, aggregated at Electoral Division and provided to the Department of Health. The scope of the arrangement between Three Ireland and the Department of Health is limited to informing the Government response to the COVID-19 pandemic only. This data feeds into wider selection of data used as part of the COVID-19 response. Only aggregated statistical data is provided to the Department of Health. No personal data is provided.
The CSO receives and manages this data on behalf of the Department of Health. Only aggregate data is provided by Three Ireland and at no time do either the Department of Health or the Central Statistics Office have access to personal data or individuals’ movements. The outputs from this analysis provide important insights for decision makers and the public in the midst of a global pandemic.
The national weighted average is calculated by weighting each county population as a proportion of total state population. These weighted SLIs are summed to generate the State Population Weighted SLI, or simply State SLI.
Example: Limerick’s population of 194,899 represents 4.1% or 0.041 of the state population of 4,761,865. When calculating state SLI, Limerick’s SLI is multiplied by 0.041 to calculate contribution to State SLI.
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