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  1. J

    Calculating probabilities with skewed distribution

    Thank you Kat. Good advice. We hadn't considered either, and will now consider both. Joey
  2. J

    Calculating probabilities with skewed distribution

    Another question! We've had a good look at different distributions and put data into online calculators to see how it fares. Conclusion. The data distribution is not lognormal and not chi^2. Then I thought that if I summed all the hits for each of the 50 random numbers, that might smooth...
  3. J

    Calculating probabilities with skewed distribution

    Tks katxt. Forgive me for not answering that just now. I will put up a full post after we've published. In the mean time do you know the answer the question on how to calculate the cumulative probability above a given value in a Lognorm distribution?
  4. J

    Calculating probabilities with skewed distribution

    I'd hoped that using Lognorm would give a useful comparison with Normal Distribution, but there's a problem with comparison. With SD, the Z Score effectively gives me the probability of a result being at it's Z Score or anywhere above. But the Lognorm online calculator gives PDF, which I think...
  5. J

    Calculating probabilities with skewed distribution

    > In the structures we are looking at, there are 2 obvious dimensions. We take the UL we are testing, and divide that into the surveyed length and see if we get one of the key calendrical numbers we are testing for. Besides integers, we accept simple fractions. There is plenty of evidence...
  6. J

    Calculating probabilities with skewed distribution

    I don't know whether talkstats flags to you entries in the thread that are not direct replies to you. In case it doesn't, please see my entry of Wed 2.12 pm
  7. J

    Calculating probabilities with skewed distribution

    Background explanation This is to give you some idea of where the numbers come from, and why it matters. Forgive me if I’m imprecise, but that is deliberate because we have a book going to print soon, and we don’t want to reveal the detail ahead of that. Over the last 30 years, studies of...
  8. J

    Calculating probabilities with skewed distribution

    Note for all. We think I need to explain to you all the jist of what this is about. I expect to have that posted tomorrow.
  9. J

    Calculating probabilities with skewed distribution

    Hi hismith, Yes, it's count data. That's why it's integers.
  10. J

    Calculating probabilities with skewed distribution

    fed2, Bearing in mind that we have multiple results to analyse, any probabilities below 0.1 (of the special number being part of the random results) would be good, as the multiple results would be mutually supportive. The example I've given is not the best and not the worst!
  11. J

    Calculating probabilities with skewed distribution

    How do you calculate the probability of a value being part of an array of values when the array is not a standard distribution? In this case we have what we think is a “special” number in terms of its ability to come up with special results in a long series of calculations. In order to test...