Validation and quality of data
- Created by: Jessmo
- Created on: 06-03-15 13:58
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- Validation and Quality of Data
- Validation Checks-used to ensure only sensible data entered into a computer
- Range check-Checks that numbers are between a certain range.
- E.g A movie site would check that a date of birth is before a certain date when renting 15-rated movies
- Format check-Makes sure that the correct mix of letters and numbers is entered
- Shopping sites may restrict postcodes to the following combination of letters (L) and numbers (0): LL00 0LL
- Presence check-Checks that a field is not empty
- When signing up to a social networking site, the username field must be filled in
- Check digit-An extra number is added to the end of a long set of numbers. This extra number is worked out by performing a calculation of the long set of numbers
- Bar codes or ISBN numbers will contain an extra number - a check digit - at the end. By looking at this, it will know if the long set of numbers is correct
- Range check-Checks that numbers are between a certain range.
- Verification checks-Check the data input is correct
- Errors can be made when inputting the data e.g characters accidentally swapped (q instead of w)
- Visual check-proofreading before submitting data
- Double-keying-entering data twice and checking both are the same
- Quality of data
- Bias-Data should not favour a particular result
- Fit for purpose-Data must be suitable for what you want it to do
- Accurate-Data must be true and correct
- Validation Checks-used to ensure only sensible data entered into a computer
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