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  • variable does not uniquely identify observations in the using data

    Hi I'm working with two data bases but there they don't have the same observations. The first one belongs to the year 1996 and the second one to the year 2010, So the one from 1996 has 335711 observations and the other one 782970. They both have the variable coduni_96 but this variable is a code number for the universities from 1996 however I can't do the merge because I have an m:m problem. Any thoughts?

  • Rocio Nunez
    replied
    Thanks! It worked.

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  • Nick Cox
    replied
    So, merge is out of the question. Possibly append makes sense.

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  • Rocio Nunez
    replied
    Yes, all of those observations are individual people who has attended to those universities.

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  • Rocio Nunez
    replied
    Click image for larger version

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    using data

    thanks for the advice!

    What I need is to tab p21_1 and niveledu_padre to compare how has this variable changed over the years.
    And that also with the other variables.

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  • Nick Cox
    replied
    I don't know what I am seeing here. Are these observations individual people?

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  • Rocio Nunez
    replied
    Click image for larger version

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    master data
    Last edited by Rocio Nunez; 12 Feb 2019, 08:10.

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  • Nick Cox
    replied
    I don't see why you're thinking of merge at all. Tell us more about what defines an observation in each dataset.

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  • Carlo Lazzaro
    replied
    Rocio:
    no thought with no data, but an advice: stay away from -m:m-.

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