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Codebook should include your decision on how to record missing data.

SPSS can define certain values as missing. Remember to be consistent with handling of missing information and its coding.

Predecide on the codes to use for missing data, etc and keep consistent with the format.

Eg. 9, 99, 999 for Don’t know

8, 98, 998 for Refusal /

7, 87, 997 for No response / Not applicable