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What is a data system?
A data system is not just a data system. It's a continuous process of the reduction of errors in recording data and data entry, a detection of errors in the data, and a correction of sources of error.
Key aspects of getting data in
Data checks at recording and entry:
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ID number validity:
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Use ID's with check digits (Verhoeff or Luhn algorithm)
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Decide how many digits you need- Add check digit (IE: 123-03-234)
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Avoid using long combinations of letters of names or locations, as these may not protect confidentiality
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Note that 2% incorrect ID's across 5 forms means you will have ~10% loss of data.
Getting your data in includes:
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​Double entry of linking variables
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Range checks
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Logical checks
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Plausibility checks
Should you use an electronic-based data system?
Advantages:
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Data are immediately entered
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Less costly for large-scale collection
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Centralized control of all aspects of form versions and changes
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Enables advanced analytics for staff activity (ie: location, time stamps)
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Disadvantages:
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Initial investment is high
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Greater expertise needed to design the system
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More staff training is needed.
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