Presentation

• Introduction:

• 2001 Census interaction data
• Developments from 1991 interaction data

• 2001 Census interaction data issues:

• Adjustment for disclosure control: impacts of small cell adjustment
• Problems of comparison between censuses: definitional, statistical, geographical

• Conclusions:

• Recommendations for 2011 outputs
• Recommendations for 2011 questions

Notes:

The aims of this presentation are fourfold.

Firstly, the 2001 interaction data or ‘Origin-destination’ statistics and the Census Interaction Data Service (CIDS) are introduced

Secondly, important issues relating to the 2001 interaction data are raised with particular focus in this paper on (a) the impact of the adjustment for disclosure control, the so called SCAM (Small Cell Adjustment Method), and (b) the problems that emerge with the data when we endeavour to make simple comparisons with data from the 1991 Census.

These issues provide a context for thinking ahead and therefore in the third section, some hopes and fears relating to future interaction data sets and their sources are considered that relate to 2011 but also other proposed developments.

Finally, by way of conclusion, the objectives of the Census Interaction Data Service over the next Census programme period are outlined.