distributions

  1. J

    Distribution evaluation problem - Updated

    Hi there! Please help me to solve the next problem Imagine there is a continuous distribution D, and we need to evaluate its parameters (most probably it's left-skewed). What we know is that the range of random variable = [0,n]. We can take a sample A of limited size m, which obeys...
  2. G

    Minimum CDF of non-independent random variables

    How can I find the CDF for F_{X,Y}={x,x} if X,Y are not-independent. In other words, what will be Pr{min(X,Y)<x} if X,Y are not-independent? If I already know the individual CDF of both X and Y, i.e. F_{X}(x) and F_{Y}(x), can they be useful to compute the Pr{min(X,Y)<x}, where X,Y are...
  3. N

    What distribution is better in these situations?

    I'm new in statistics and probability and I'm a little lost about what distribution is better in these situations: If a tumor is malignant or not --> Bernouilli Number of entries in an emergency service during a night, know that on average 20 entries are observed per night. --> Poisson Tumor...
  4. J

    Where did I go wrong in these three questions?

    Hi everyone, I just finished taking an online test and found out that some of my answers were wrong. The questions and answers can be found in attached screenshots. Question 1 (Suppose T and Z are random variables) https://s9.postimg.org/7krqdwirz/image.png I got no credit looks like it is...
  5. L

    Multilevel modeling - dependent variable is not normally distributed

    Hello everybody, I am doing the research, using Multilevel linear modeling (MLM), with dependent variable number of days of payment delays, which is not normally distributed. Is that a problem for MLM? Is it necessary for Y to be normally distributed? I have done a winsorisation- have limited...
  6. T

    Chi Squared test of proportions

    Hi there, I am currently coming towards the end of my dissertation, and I am looking for a bit of help with how to test distributions using a chi squared test with the data that I have. I have attached a picture of mocked up data that represent what I am trying to test. The first table is...
  7. S

    Model Verification: Verification of Environmental Dispersion Model

    I am working with an environmental dispersion model, that I am trying to verify with measured data. We have a six receptors (measurement stations) in the field that measures gas concentrations that could be attributed to release from a plant. For each receptor I have 28 (14 years of semi-annual...
  8. S

    Comparison of average values of data sets

    Hi, I want to know if mean of A>B and A1, A2 are the two subsets of A. Similarily, B1, B2 are two subsets of B. Is the condition A1<B1 and A2<B2 mathematically possible????? As I think it is not. I think that either both or at least one subset must have shown the same relationship in their...