data is collected from an original source.eg by the organisation itself.
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Secondary Data (Indirect Data)
data which has been used for a purpose different to that for which it was originally collected. Eg bought in or collected by someone else
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Plagiarism
You are guilty of plagiarism if you claim work is yours when it has been taken from another source.
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Qualitative data
is based on categories eg hair colour, what your opinion is of a film
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Quantitative data
is data based on numerical measurements eg height.
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Focus groups
Gather information from groups of individuals with a particular interest eg Health services, political voting
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Validation
is the act of checking by the computer software, on data entry that the data is sensible, reasonable, in the right format, conforms to rules , within set boundaries, the right type.
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Presence check (required field)
Certain fields such as customer number, item code, quantity etc must be present.
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Format check (also called picture check)
Data is entered in a certain arrangement/pattern e.g. code may have a pattern of 2 letters followed by 4 numbers.
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Range check
Value entered must fall between an upper and lower limit eg A card expiry date must have a month number between 1 and 12, and date must be after today
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Batch header checks
The total number of records in the batch are calculated and included in the batch header . The file is transferred and the total number of records recalculated and compared with batch header.
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Type check
Ensures the data entered is of the correct type eg numeric real or integer, text, currency, data, time
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Length Check
Ensures that the number of characters in the string is sensible
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File lookup check
If the customer has filled in their customer number, the computer can look this up on the customer file and display the name and address. The data entry operator can check that it tallies.
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Check digits
A check digit is a number, appended to the end of the code number, used to check the whole of a code has been entered correctly.
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Verification
Verification is making sure that data has been accurately transferred or transcribed (copied) form one medium to another (eg paper to magnetic disk) or one computer to another computer (eg email)
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Transcription
errors in copying the data eg Harris entered as Harriss
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Transposition
swapping characters eg 2345 entered as 3245
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Numerical modelling
Numerical modelling is the process of producing a mathematical model to perform predetermined actions
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Data modelling
means to make a conceptual image or model of the meaning of the data to help to consider alternatives
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Data modelling
means to make a conceptual image or model of the meaning of the data to help to consider alternatives
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Other cards in this set
Card 2
Front
data which has been used for a purpose different to that for which it was originally collected. Eg bought in or collected by someone else
Back
Secondary Data (Indirect Data)
Card 3
Front
You are guilty of plagiarism if you claim work is yours when it has been taken from another source.
Back
Card 4
Front
is based on categories eg hair colour, what your opinion is of a film
Back
Card 5
Front
is data based on numerical measurements eg height.
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