A researcher enters the following ages into Excel: 23, 31, 29, 27, 31, 999, 35, 28. The codebook states that 999 represents “missing.” Which approach is most appropriate before calculating the mean age?

Question

Accepted Answer

Exclude the coded missing value from the calculation and document the missing-value code

Answer

Replace 999 with the maximum observed age

Answer

Replace 999 with age 0

Answer

Include 99 because it is an error when entered the numerical value

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A researcher enters the following ages into Excel: 23, 31, 29, 27, 31, 999, 35, ...

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