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  • sampling method

    I would be grateful if you could let me know what kind of sampling method is used in the following research (discrete time survival analysis)? Is it purposive (judgemental) sampling or the whole population is studied? All companies listed on the stock market during 2000-2017 are included except:

    1- financial companies (e.g. banks, insurance companies, and etc) because they are operating in a different legal environment. Besides, their financial structure are also different.

    2-companies which are bankrupt in 2000. Since we want to predict bankruptcy, the sampled companies should be healthy at the start of research.
    3- furthermore, if a company went bankrupt in 2010, the data for later years (i.e., 2011, 2012, and so on) are not included in the sample.

    Thanks in advance,


    Last edited by shahla ebrahimi; 11 Jul 2018, 06:48.

  • #2
    Shabla:
    as per your description:
    - it seems that Authors adopted (at least) two exclusion criteria (that is, those you mentioned);
    - I cannot say whether, conditional on the applied exclusion criteria, the sampling from the remaining population was random or not.
    Kind regards,
    Carlo
    (StataNow 18.5)

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    • #3
      Hi Carlo
      Thanks
      All companies during the aforementioned period are sampled except those which are excluded. Exactly saying, all the remaining population was selected.
      Last edited by shahla ebrahimi; 11 Jul 2018, 06:49.

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      • #4
        Shabla:
        thanks for providing further details.
        It seems that the main issue here is the way the included companies were sampled (random sample; stratified random sample; judgement sample; convenience sample).
        See, if interested, https://www.cengagebrain.co.uk/shop/isbn/9780495105275.
        Kind regards,
        Carlo
        (StataNow 18.5)

        Comment


        • #5
          The exclusion criteria seem to define the population, and that entire population was studied. So no sampling took place.
          ---------------------------------
          Maarten L. Buis
          University of Konstanz
          Department of history and sociology
          box 40
          78457 Konstanz
          Germany
          http://www.maartenbuis.nl
          ---------------------------------

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          • #6
            Shabla:
            hence if the entire population was selected, there was no sampling (event though researchers might have been intererested in superpopulation; see, if interested, https://www.cengagebrain.co.uk/shop/isbn/9780495105275, pages 40-41).
            Kind regards,
            Carlo
            (StataNow 18.5)

            Comment


            • #7
              Hi
              Maarten
              Thanks a lot.

              Comment


              • #8
                Thank you both very much

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