Technical Reports


Technical Report on Fieldwork

The central objective of this technical report is to document NatCen’s contribution to the first sweep.  It contains the following information:

  • Development work undertaken to prepare the first sweep, which included a pilot survey and dress rehearsal
  • The sample design and the procedures for respondent selection
  • Summary of the final survey instrumentation
  • How the fieldwork was conducted
  • The progress of fieldwork, quality control thereof and issues which arose during this phase
  • The verification of information on the achieved sample and the dispatch of thank you letters to respondents Survey response
  • Procedures for coding, editing and preparation of the data

Documents used in the study are to be found in the Appendix.

Technical Report on Sampling (4th Edition)

This document is the third edition of what is expected to be a continually expanding description of the design and sampling outcomes of the Millennium Cohort Study as it progresses from sweep to sweep. It covers all the material (except for the appendices) from the first edition (August 2001), some of which has been slightly amended. It includes the rationale for the underpinning design, the definition of the study population, the target sample for Sweep 1 and how it was selected and obtained.

In addition, it includes final response rates for Sweep 1 (cohort at nine months of age), and the computation of sampling errors for the Sweep 1 data, taking into account the effects of stratification and clustering. These results were included in the second edition (May 2003) but have been slightly amended and expanded to take account of corrections to the dataset after the initial deposit with the Data Archive. This third edition also includes new material, in particular analyses of non-response for Sweep 1.

The 4th edition  includes some details on multiple births and the cohort child’s age at interview that were not in the third edition. Details about response after sweep one can be found in Plewis and Ketende (2007).

Infant Mortality in the MCS Sample Areas

This report investigates how many children in the birth cohort (from which the MCS was sampled) did not survive long enough to be included in the survey which took place at 9 months.  Not only would infant mortality within the birth cohort result in some cases with early deaths being missed out of MCS, but the possibility of differential infant mortality between social groups could bias the sample of survivors.