Flow Data Information System

1981 Census: Special Migration Statistics (Set 2) (re-estimated for 1991 boundaries; incorporating pro-rate migrants with 'origin unstated')

The 1981 SMS refer to counts of individuals who were in existence 12 months before the Census and who were resident at a different usual residence on 5 April 1981 to that a year previously.

There are two data sets. 1981 SMS Set 1 are a complex set of flows within wards, from each ward to each district and vice versa, from outside GB to each ward and from origin-not stated to each ward. Cole and Squires (1987) explain how the structure of the data is complicated further by 'thresholding' procedures to ensure confidentiality which greatly limit use of the data.

1981 SMS Set 2 are separate counts of males and females migrating within and between each pair of wards defined in 1981. They have not been subject to data adjustment or thresholding. In an attempt to create a consistent comparison between 1981 and 1991, a recent Census Development Project has involved the re-estimation of 1981 SMS Set 2 data for wards whose boundaries were used in the 1991 Census. The estimation methodology is available in a paper published in Computers, Environment and Urban Systems (Feng and Boyle, 2001)

Users can choose between 2 counts (males and females) in the re-estimated SMS Set 2 data for which the geographical areas are identical to those used in 1991.

Pro-rate distribution of migrants with 'origin unstated'

Migrants who did not give a full origin were coded as having 'origin unstated'; in this version of the data those migrants have been allocated origins in the same proportion as all other flows to a given destination.

References

Ballard, B. and Norris, P. (1983) User needs - an overview, Chapter 3 in Rhind, D. (ed) A Census User's Handbook, Methuen, London: 89-113.

Cole, K. and Squires, S. (1987) The Special Migration Statistics from the 1981 Census: the data and their implications, Paper presented at the LAMSAC Workshop, County Hall, London.

Feng, Z. and Boyle, P. (2001) Integrating the 1981 and 1991 census interaction data, Computers, Environment and Urban Systems, forthcoming.

Citation information

The following statements should be attached to all output produced using this data set

Data from this set should be cited in a bibliography as:

Office for National Statistics, 1981 Census: Special Migration Statistics (Set 2) (re-estimated for 1991 boundaries; incorporating pro-rate migrants with 'origin unstated') [computer file], UK Data Service

Further information

The following pre-defined totals are available from this data set:

There are 1 tables defined for this data set:

The data are available for the following geographies:

Geographies of origin areasGeographies of destination areas
Supported directly
[i]GB Districts 1991
[i]GB Wards 1991
[i]GB Counties 1991
[i]GB Standard Regions 1991
[i]GB Districts 1991
[i]GB Wards 1991
[i]GB Counties 1991
[i]GB Standard Regions 1991
Supported via aggregation
[i]GB Countries 1991
[i]GB Parliamentary Constituencies 1997
[i]GB 1997 General Election - Results
[i]GB 1997 General Election - Swing
[i]GB Standard Region Urban / Rural components
[i]DETR 99 zone system
[i]Great Britain
[i]CIDS 1991/2001 common geography - 'districts'
[i]CIDS 1991/2001 common geography - 'intermediate'
[i]CIDS 1991/2001 common geography - '100 zones'
[i]CIDS 1991/2001 common geography - 'city regions'
[i]GB Countries 1991
[i]GB Parliamentary Constituencies 1997
[i]GB 1997 General Election - Results
[i]GB 1997 General Election - Swing
[i]GB Standard Region Urban / Rural components
[i]DETR 99 zone system
[i]Great Britain
[i]CIDS 1991/2001 common geography - 'districts'
[i]CIDS 1991/2001 common geography - 'intermediate'
[i]CIDS 1991/2001 common geography - '100 zones'
[i]CIDS 1991/2001 common geography - 'city regions'

Output for geographies that are only supported via aggregation will take longer than for those supported directly

Table frameworks


Table 1: Migrants usually resident/formerly resident in ward by sex
Male Female
Count 1 2