How do the ideal census output areas for South Africa look like? - - PowerPoint PPT Presentation

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May 05, 2023 230 likes •408 views

How do the ideal census output areas for South Africa look like? Helene Verhoef 5 September 2019 Introduction Historic statistical geographies Output geographies

SLIDE 1

How do the ideal census

utput areas for South Africa

look like?

Helene Verhoef 5 September 2019

SLIDE 2

Introduction Historic statistical geographies Output geographies International trends Research done at Statistics South Africa Characteristics to consider Discussion

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Importance of census data Why not disseminating data on EA level ? Designed to execute a census Workload to be done in 21 days Not the same size – pop / area Population density Terrain plays a role Enumerator walking or driving Literacy and language Time

Introduction

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Output geographies

Output geographies are the areas that are used to geo-reference statistical data – statistical geography Standard output geographies Non-standard output geographies National Magisterial districts Province Traditional Areas District Municipalities Metros Wards Local Municipalities Voting districts Main places Sub-places Small Areas Enumeration Areas (Enumeration Areas)

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Historic statistical geographies for South Africa

Pre 2001 Administrative areas: Province Magisterial districts Urban and Rural Towns 1991 TBVC and sampled areas 1996 Magisterial districts, EAs with place names, Lumped EAs 2001 Administrative areas: Province District Municipalities Local Municipalities and Metros Place name areas: Main places and Sub-places Small Areas

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International trends

Mixture of administrative and statistical units Refer to Annexure A Annexure A.pdf

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International building blocks

Building block type Country Country -specific name Scale/size (year) Method of creation Postcode England and Wales Unit postcode Ave 17 delivery points (2001) Automated Street block Australia Mesh block Ave 30-60 dwellings (2011) Hybrid New Zealand Mesh block Ave 97 people (2006) Manual USA Census block Ave 28 people (2010) Hybrid (mostly automated) Grid squares Denmark National square grid (100 m) Ave 6 households (2003) Automated Finland Grid cells (250 m) Mean 16 people (2010) Automated

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Standardised building block potential

UK motivation for output areas: Temporal stability, min pop (reduced area suppression), max pop (uniformity), intuitive (visible) boundaries, compact shape and homogeneity

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Investigation done at Statistics South Africa

Ingredients Address / structure coordinates – points Road centre lines / Grid

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Urban

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Traditional areas

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Farms

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Gridded population

1996 2011

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Gridded population : 2011 SAs

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Characteristics to consider for lowest level output areas

Should they ideally be:

as small as possible in terms of physical area

and population size,

as compact in shape as possible,
as homogeneous as possible – tenure /

dwelling type

fall within administrative boundaries
fall within place name areas
be contiguous or holes accepted
null values accepted

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Discussion

These criteria will most likely not be enforceable all at once Need to prioritise in order of importance: absolute enforcement to relaxing

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