distribution

  1. P

    differential distribution frequency

    Hi there. pls I'm studying the production of energy from sawdust.So I need a firm grip in powder technology.Can anyone pls show me mathematically how the differential distribution frequency fm(D) was obtained in the attachment below. the data is from a published journal.Many thanks
  2. L

    Can I use a Negative Binomial Regression for a Continuous Outcome?

    Hello, My outcome is Sugar intake with a highly skewed continuous outcome variable. The histogram and variable details are Attached. Since the distribution is highly skewed and has a very high variance (12.78) compared to the mean (2.67) I thought I could round each decimal to the nearest...
  3. R

    Comparing means with Poisson distributed data?

    Hi everyone! How can I perform ANOVA, so to compare means, when the data of my groups are clearly Poisson distributed (towards 0 values)? Thanks a lot! Cheers
  4. trinker

    Show distributions, same height different variances

    I want show two distributions on the same pot that have identical height but different variances. I understand logically why my approach below doesn't result in equal heights. Now how can I force it to have equal heights. if (!require("pacman")) install.packages("pacman")...
  5. A

    Detecting Change in not Normally Distributed Count Data

    Hello, I was wondering if anyone could shed some light on how to interrogate count data whichholds a lot of 0'sand therefore not normally distributed. I have pasted in an example of the dataset i'm using. It gives 4 species counts across 27 sites (replicates) across intermittent years...
  6. A

    Aggregate Loss Model (Actuarial Science)

    Question: Let S be the random sum of N independent frequencies {{M_i}} where N is negative binomial distributed with r = 5 and \beta= 3 and {M_i} is Poisson distributed with  = 3. Find F_S(3) Attempt: I know the formulas for these two distribution, but I am totally lost of how I...
  7. hanialbarni

    How to test data if it is normal distribution in spss ?

    Hello Good morning guys i will need some help truly i have variables in spss most of them scale type, some of them are nominal, and few are ordinal. My questions how can i get the graph for normal distribution for the whole data ? shall i combine all scales into one variable and combine all...
  8. C

    Need help starting this question; unable to identify what type of question it is

    I can't tell if its asking for a binomial distribution or a normal probability distribution.. or maybe an approximation of a binomial distribution using a normal distribution..but then where does a random variable come in? here is the question: A company that manufactures mufflers for cars...
  9. E

    How well a few values fit a given distribution?

    Dear all, I have approximated two one-dimensional random variables A and B using Gaussian Mixture Models (3 gaussians). I used gmdistribution.fit Matlab function with 10000 values. The resulting distributions are called f_{A}(x) and f_{B}(x) (shown in attached Figure 1, being...
  10. G

    sampling distribution question help.

    "Mendel’s laws of inheritance indicate that individuals in a second-generation cross have a 75% chance of carrying a dominant trait and a 25% chance of carrying a recessive trait. Inheritance occurs independently in each individual. What is the sampling distribution of the proportion of...
  11. E

    What type of distribution is?

    Usually results of direct measurements are normally distrubuted. Also, if we make linear transformation on result. e.g. if X it is a normally distrubuted random variable, also Y=a+bX also it is. Statement is not any more thrue, if we make exponential or logaritmic transformations. e.g. if Y...
  12. A

    Comparison of two treatments (paired and unpaired)

    Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b significantly different from one another, and why? Questions a and b are answered on a scale from 0 to 10. My data: 153 survey responses, split into 3...
  13. Q

    Profiling a Number Series

    Hi everyone, I'm new here. My question is how do you profile a series to determine what kind of distribution it is? For example a series of returns in the financial stock market. Is there a way to define the distribution type and characteristics based on a given number series (in this case...
  14. B

    Sum of n random variables with normal distribution

    I am struggling with this problem: Independent random variables X_1, ... , X_n have normal distribution with mean 0 and variance 2. What is the distribution of random variable: X_1 + ... + X_n ? I know that the sum od two random variables with normal distribution has normal distribution as...
  15. K

    What type of distribution is this and am I being sensible?

    I have a computer model, which I need to run 3500 times with different input parameters. The model's accuracy depends on a constant, let's call it T, which unlike the input parameters doesn't change between model runs. By decreasing T, the model's accuracy improves but the computational cost...
  16. trinker

    Link function for proportional outcome

    I have a data set where the outcome variable is percent passing (ELA and Math tests) for school districts. I will use a 2 level multilevel model with various predictors/covariates at level one and two. The outcome variable is percent passing. Obviously the outcome is limited to between 0...
  17. G

    Fieller-Hinkley Ratio of Correlated Random Variables: Question On Applying Theory

    I am a senior in college writing a thesis analyzing and critiquing government income transfer programs, such as SNAP (food stamps). Here is my issue. I am using data collected from the consumer expenditure survey, which will typically provide means, sample sizes, and standard errors. I am...
  18. G

    Fieller-Hinkley Ratio of Correlated Random Variables: Question On Applying Theory

    I am a senior in college writing a thesis analyzing and critiquing government income transfer programs, such as SNAP (food stamps). Here is my issue. I am using data collected from the consumer expenditure survey, which will typically provide means, sample sizes, and standard errors. I am...
  19. R

    How to create an unbiased fit to the data (Keyboard log data for each user)

    Hi all , So I have a very simple distribution of events (eg user keyboard log for five employees). Now if suppose I consider frequency of each key pressed for a single user, and for all users. And then suppose I want to see what distribution this data follows ( without any bias toward any...
  20. T

    Negative Binomial Distribution? NEED ADVICE AND HELP!!!!

    Assume City A has three parties, Party B, Party C, and Party D, with n1, n2, n2 citizens in them, respectively. Assume, for people in B, they will always support the motion by the government, while, for people in C, they will always be against the government. However, those in D will support the...