Problems of the measurement and adjustment of counts

• SCAM adjustment of counts (already discussed)

• Unlike 1991, where infants aged less that one were excluded altogether from migrant counts, in 2001 they are included by giving them the migrant status of their ‘next of kin’ (in households only)

• Under-enumeration allowed for through imputation in 2001 (One Number Census), though incomplete

• 1991 category of migrant with origin not stated disappeared in 2001, BUT new category of migrant with no usual address one year ago introduced

• Difficulties in defining what are the populations at risk for some variables, e.g. moving groups, because no matching data for non-migrants in ODS or Area tables

Notes:

Problems of the measurement and adjustment of counts involve:

the inclusion of infants aged under 1 in 2001

underenumeration in 1991

the inclusion of migrants with unstated origins in 2001

the inclusion of migrants with no fixed address

the difficulties in defining populations at risk

the SCAM adjustment of counts for confidentiality discussed previously