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The uneven lag between the actual move and the registration of
a move is a serious impediment to measuring interprovincial
migration as it is not systematically correctable.
Uneven eligibility (coverage) as certain
provinces do not cover all non-permanent residents or military
etc.
Uneven content (see previous table).
Uneven administration (processing).
Clumping of cases seems to occur over the summer months as a
backlog of unprocessed requisitions only get processed in the fall
(this phenomenon is unpredictable and may be subject to other
provincial effects like labour disputes).
Accuracy
Special rules may affect the measurement of migration.
Certain groups are excluded (see coverage) so
their migration is not measured.
One of Alberta's administrative rules prevents certain
migrations from being measured as they will defer registration up
to 12 months for married persons until both spouses have
relocated.
Opting out of medical coverage may impact on who
registers.
Short-term migration is likely missed by the health care files
because of the complexity of eligibility rules versus the risk of
not having health coverage for the short period. People with
temporary employment may not register.
Incomplete administrative records (See missing data points in
Annex G and see unknown origin category in
Saskatchewan in Annex D).
