Centre for Longitudinal Study User Information and Support

The Centre for Longitudinal Study Information and User Support is an ESRC-funded group based at UCL. We help UK academic, statutory and voluntary sector researchers to use the Office for National Statistics (ONS) Longitudinal Study (LS). This service is free to the user.


Find out how we help researchers to use the ONS Longitudinal Study

Using the ONS Longitudinal Study

All you need to know about using ONS Longitudinal Study data

About the ONS Longitudinal Study

Find out more about this outstanding research resource

Projects using the ONS LS

Current and previous research using the ONS Longitudinal Study

Contact us

Get in touch to discuss your research ideas


Sources of information and guidance

CeLSIUS reduced service level

CeLSIUS is currently operating at a reduced service level due to staff shortage: please be aware that there usually will only be one user support officer per day available in the ONS office from now until the autumn this year. We must therefore ask for your patience during this time as we are afraid that work will inevitably be slower during this period.


Presentations and practicals materials now available from 'A showcase of student research using the ONS LS and census microdata', held on 28th Marc 2018


Recent changes to ONS LS output clearance procedures:

LS users may have received several emails from CeLSIUS/the ONS relating to changes to clearance procedures - please note that the following are the only changes that have occurred recently:

  • 'Pre-publication' clearance will replace 'Intermediate Outputs'.
  • ‘Publication' clearance will replace 'Final Outputs'.
  • BOTH procedures will require results to be aggregated to the same minimum cell threshold. That is, in results from which a count of individual persons could possibly be calculated - e.g. percentages, or graphs based on percentages - the cell count will be 10 or more.
  • However, both types of clearance may be possible for results which do not meet this criterion if there is a scientific justification, i.e. both a reason why clearance of lower cell counts is needed, and a persuasive argument that in this case they could not lead to disclosure.
  • Publication and Pre-publication clearances will involve two members of staff.
  • LS users working overseas will be dealt with on the same basis as those based in the UK.

Please also note that CeLSIUS support officers will continue to:

  • do pre-publication clearance on log files and other formats
  • run code for users and send out the cleared outputs (subject to the conditions outlined above)
  • alter users' outputs where necessary to make them clearable

Contact us for further information.


Book chapter on the UK LSs

Longitudinal Studies in the United Kingdom by Nicola Shelton and Oliver Duke-Williams of CeLSIUS, Chris Dibben of SLS-DSU and Ian Shuttleworth of NILS-RSU is a book chapter in the The Routledge Handbook of Census Resources, Methods and Applications edited by John Stillwell.

From the publisher's website:

The Routledge Handbook of Census Resources, Methods and Applications provides a comprehensive and authoritative guide to the collection, processing, quality assessment and delivery of the different data products that constitute the results of the population censuses conducted across the United Kingdom in 2011. It provides those interested in using census data with an introduction to the collection, processing and quality assessment of the 2011 Census, together with guidance on the various types of data resources that are available and how they can be accessed.

Page last modified on 30 oct 17 12:06 by Joanne Tomlinson