Centre for Longitudinal Studies

Step 11

Create new variable NEWTOTBY to count how many babies are represented in the
newly re-arranged data, and check this is the same in total as the number of babies
before re-arrangement (see Step 6).

Step 12

Having checked that no outcome data was lost, delete all NCDS outcomes earlier than
March 1991, unless cohort member was not contacted at the 1991 survey (see
Appendix 4).

Step 13

Do manual scrutiny of cases with any outcome years entered as ‘9999’ (see step 4),
true multiple births, dubious multiple births, and those still pregnant but where that
pregnancy is not placed in most recent birthslot (see step 8).

Step 14

Implement syntax for case-by-case re-ordering in the light of the manual scrutiny.

Step 15

Save SPSS system file, disposing of all the working variables created during this
algorithm, and saving the altered versions of all the original variables.

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