(Core NILS Data) patients. This data is referred to as Health Card Registrations. Census (1981, 1991, A member of the household completes a form on behalf of everyone within 2001, 2011) the household and then the details are captured (typed from form in 1981 and 1991 and using optical character recognition in 2001 and 2011). In the 2011 Census, an online form was also available for each household. General Register Office Information gathered from face-to-face interview with informant of birth – (GRO) Births usually the mother or father of the baby. GRO Deaths Information gathered from face-to-face interview with informant of death – usually a relative of the deceased. GRO Marriages Information gathered from the marriage certificate when marriages are registered at the Registrar’s Office. The variety of ways that the data is collected and the amount of verification applied before the data is entered onto the system invariably mean that the data will not be identical on all systems. The differences may be minor, such as a slightly different spelling of the surname or they could be significant such as an incorrect address, date of birth or a middle name used in place of a forename. Therefore it is important to ensure that any matching algorithms take account of non-exact matched records. NILS Data Matching Process There is some variation in matching methodology between datasets due to individual characteristics of each data source. However, there is a general approach adopted when matching new data into NILS/NIMS for the first time. This takes the form of: Data preparation; Automated data matching; Step 1 – Manual verification of automatic data matching; Step 2a – Multiple choice; (optional) Step 2b – Manual search; and Step 3 – Cross verification and quality checks. As previously mentioned, when matching data into the NILS, the reference or ‘spine’ data source is the Health Card Registration data. For the NIMS the reference data are the relevant Census Source (1991 Census for NIMS91, 2001 Census for NIMS01, 2011 Census for NIMS11). i. Data preparation The aim of the data preparation stage is to standardise corresponding match fields within the two data sources to be linked. At this stage the data is analysed to assess the key matching fields for quality and
(Core NILS Data) patients. This data is referred to as Health Card Registrations. Census (1981, 1991, 2001, 2011) A member of the household completes a form on behalf of everyone within the household and then the details are captured (typed from form in 1981 and 1991 and using optical character recognition in 2001 and 2011). In the 2011 Census, an online form was also available for each household. General Register Office (GRO) Births Information gathered from face-to-face interview with informant of birth – usually the mother or father of the baby. GRO Deaths Information gathered from face-to-face interview with informant of death – usually a relative of the deceased. GRO Marriages Information gathered from the marriage certificate when marriages are registered at the Registrar’s Office. The variety of ways that the data is collected and the amount of verification applied before the data is entered onto the system invariably mean that the data will not be identical on all systems. The differences may be minor, such as a slightly different spelling of the surname or they could be significant such as an incorrect address, date of birth or a middle name used in place of a forename. Therefore it is important to ensure that any matching algorithms take account of non-exact matched records. NILS Data Matching Process There is some variation in matching methodology between datasets due to individual characteristics of each data source. However, there is a general approach adopted when matching new data into NILS/NIMS for the first time. This takes the form of: Data preparation; Automated data matching; Step 1 – Manual verification of automatic data matching; Step 2a – Multiple choice; (optional) Step 2b – Manual search; and Step 3 – Cross verification and quality checks. As previously mentioned, when matching data into the NILS, the reference or ‘spine’ data source is the Health Card Registration data. For the NIMS the reference data are the relevant Census Source (1991 Census for NIMS91, 2001 Census for NIMS01, 2011 Census for NIMS11). i. Data preparation The aim of the data preparation stage is to standardise corresponding match fields within the two data sources to be linked. At this stage the data is analysed to assess the key matching fields for quality and
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