Data is usually coded when collecting data e.g. Greta Britain becomes GB. Data is encoded because:
Ø Coded data takes less effort to enter
Ø More data can appear on the same screen
Ø Easier to check that the code is correct
Advantages: Disadvantages
Takes up less momory people may be confused over code
Faster to enter data Less accurate
Fewer errors Possible to run out of codes
Rely on personal judgement
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