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    When the mean values for wage and income variables fluctuate, or are too large
  • When the mean values for wage and income variables fluctuate, or are too large

     

     

     When calculating the mean value for wage or income variable, the biggest attention
    should be given to handling non-responses. Wage and income variables in KLIPS are all
    top-coded in 6 digits, and non-responses are marked ‘-1’. Thus, if non-responses are not
    handled as missing values, it could lead to problems such as the values appearing bigger
    or the trends being invisible.


     It might be more convenient for the data user if the KLIPS team treated all
    non-responses as missing values across the board. But to ensure better research accuracy,
    '-1' is not re-processed as missing values in the data being made available, because
    non-response and missing value completely different from each other. In addition, there
    has been no actual case of top-coding yet, as no one reported a monthly average wage
    higher than 10 billion.


     When using wage and income variables, it is recommended to first obtain the
    elementary statistics, check if they are consistent with the missing values listed in the
    codebook then process the non-response values.​

     

     

     

    <KLIPS User's Guide (Wave 1~18th) FAQ Q25>

     

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