An expert panel, consisting of 2 APs and 1 NF, reviewed our current EMR and identified 98 unique data items that are available to clinical users.
In the absence of a shared, unique key, record linkage involves the comparison of ensembles of partially-identifying, non-unique data items between pairs of records.
Potentially re-identifiable data contains sufficient, usually non-unique, data items to allow identification of individuals to whom the data relate with a reasonable degree of certainty.
The aim of this split-file approach is to enable the removal of the commonly-recognised identifiers from a dataset, and to replace them with a unique, non-identifiable data item, so that data linkage can take place at the individual record level without any identifiable information passing from one organisation to another.
Every node u keeps track of the number of unique requests for a data item i (request frequency).
When a block is copied by a transformation, it is given the same name but a new, unique identifier (similarly, separate deployments of the same service share the same name, but have a different unique identifier), e.g. a transform copying data item (d,14) could generate (d,27) where 27 is a unique identifier, not shared with another block.
One of the many unique features of biological databases is that the mere existence of a ground data item is not always a precondition for a query response.
Traditionally methods of operating disease registers have required that notifications of cases be identified by unique identifiers such as social security number or national identification number, or by ensembles of non-unique identifying data items, such as name, sex and date of birth.
Each data item has a unique key pointing to it.
We need to assign a unique ID (or pseudonym) to each data item, which we in the following refer to as I D di.
These data included a unique item code for each medical service delivered.
