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  • Ech@lemmy.caEnglish
    2·
    6 days ago

    Besides the fact they nobody knows what is being done behind the scenes to ensure results are (or aren’t) fair, using a sample of individuals that are all attempting to play the system against each other deeply and irreparably biases the data.

    On top of that, jokes like the one I responded to and comments like yours only serve to legitimize a “service” thats sole purpose is to squeeze every penny from its users. It doesn’t provide anything beneficial to anyone but its owners.

    • 5318008@lemmy.mlEnglish
      11·
      3 days ago

      If the contract isn’t something that meets the criteria for an efficient market, then yeah, it’s not something that can be used to give reasonable probabilities.

      But for something like, winner of the democratic presidential primary, or the proce of gold in a month… then it’s genuinely a better predictive model than what a statistician would be able to come up with.

      It doesn’t provide anything beneficial to anyone but its owners.

      For statistics purposes, it gives me something incredibly beneficial. Simply by knowing the price of a contract, I can know with decent accuracy how likely something is to happen.

      If you’re not in the field, you wouldn’t necessarily appreciate how valuable that is.

      • phutatorius@lemmy.zipEnglish
        1·
        3 days ago

        it’s genuinely a better predictive model than what a statistician would be able to come up with

        OK, let’s see the evidence for that assertion.

        Simply by knowing the price of a contract, I can know with decent accuracy how likely something is to happen.

        A retrospective analysis of the contract prices versus actual outcomes would also be needed. Otherwise, all you’re seeing is an opinion poll conducted on a self-selected sample of people unusually prone to being greedheads. And you have no idea of the mechanisms that shape that market.

        • 5318008@lemmy.mlEnglish
          1·
          3 days ago

          OK, let’s see the evidence for that assertion.

          Using prediction markets to estimate the reproducibility of scientific research - PMC

          There’s one.

          But obviously it’s not a guarantee if you don’t know what you’re doing. We also have documentation on where these methods fall short, such as when it’s based on exponential growth, rare events, or something else that humans are bad at understanding. Infectious Disease Forecasting.

          But again, good statisticians are prepared to address those things.

          And you have no idea of the mechanisms that shape that market.

          That’s even better. If I don’t understand the mechanisms shaping the market, I won’t be able to correctly identify predictive variables for my model. In that case, I would be better off trusting the prediction market.

          Obviously it would be better if the person building the model understood the mechanisms… but that takes time and money. If you’re managing 30 models, that might not be worth it.