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  • Uninterpretable values in Stata output

    Hello, everyone!
    I’d appreciate some help. I’m running a multinomial regression to assess the association between physical performance trajectories (3 trajectories) and some associated factors. In my descriptive table, I noticed that none of the individuals in one of the categories of a variable were classified in the “high” trajectory group.

    When I ran the regression, Stata gave me the following output:
    RRR = 888985.4 | Std. err. = 3.74e+08 | z = 0.03 | p = 0.974 | 95% CI = 0 - .

    Given this, I thought about recategorizing the variable, but it doesn’t seem like the best option, since it would involve merging groups with very distinct characteristics.

    Is there any way to interpret this, or is recategorization the only solution?

    Thanks in advance for your time and help!


  • #2
    I can think of several things that may have happened, but with the information provided, there is no way to figure out which might actually apply. I think your chances of getting a helpful response would be greatly improved by posting:
    1. The complete output of the multiple regression, not just one line from the coefficient table. Include any warnings, notes, or messages that appear before or after the table. Actually show everything that Stata wrote in the Results window (or your log file) following the command.
    2. The exact multinomial regression command you gave, copy/pasted from your do-file or log-file.
    3. Example data, using the -dataex- command to do so. If you are running version 18, 17, 16 or a fully updated version 15.1 or 14.2, -dataex- is already part of your official Stata installation. If not, run -ssc install dataex- to get it. Either way, run -help dataex- to read the simple instructions for using it. -dataex- will save you time; it is easier and quicker than typing out tables. It includes complete information about aspects of the data that are often critical to answering your question but cannot be seen from tabular displays or screenshots. It also makes it possible for those who want to help you to create a faithful representation of your example to try out their code, which in turn makes it more likely that their answer will actually work in your data.

    Comment


    • #3
      Hello, and thank you for the prompt response.
      I’m attaching a screenshot of the Stata output, along with the command I used to run the analysis.
      Attached Files

      Comment


      • #4
        Thank you. If you read the Forum FAQ, you will see the recommendations for the most effective ways post here. Among them, you will see that screenshots are discouraged, for several reasons. One of those reasons is that often they turn out not to be readable. And that is the case here. When I try to open the screenshots you attached, all I get is a blank screen. In the FAQ you will see that the best way to show results and commands is by copy/pasting them into the Forum editor, between code delimiters. (The FAQ also explains code delimiters, if you are not familiar with them.)

        So please read the FAQ, and then post back.

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