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Dealing with Missing Data

Missing data is generally coded as 9 using SPSS software package. Zero or -1 can also be used.

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DEALING WITH MISSING DATAFirst Step – If there are only a few cases where one or more items do not have a response, depending on the sample size, these few cases can be eliminated without negatively impacting the analysis.

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For exampleBefore Person Item 1 Item 2 Item 3 Item 4

Bob 3 5 6 3Fred 2Sally 1 3 4 1Zelda 2 4 5 3

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For exampleAfter Person Item 1 Item 2 Item 3 Item 4

Bob 3 5 6 3Sally 1 3 4 1Zelda 2 4 5 3