# distribution

1. ### 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...
2. ### 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...
3. ### 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...
4. ### 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...
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### 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...
6. ### 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...
7. ### 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...
8. ### 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...
9. ### 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...
10. ### 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...
11. ### distribution of sum of dependent binomial variables

I have N bernoulli dependent variables, X1, X2, ..., XN, and Xi ~ B(1, pi), pi is already konwn. And Y=X1+X2+...+XN, I need to get the distribution of Y. If Xi, Xj is independent, then I can use the simulation, generate X1,...,XN using the bernoulli distribution, and get the Y; repeat 10000...
12. ### Question about Standard Normal Distribution (Finding probability)

Suppose Z is a random variable having the standard normal distribution. 1)Find the probability that Z is between 0 and (1.08 + R/10) 2)P(–w < Z < w) = 0.8942 - R/50, Find the values of w My Answer: P(0<Z<1.08+R/10) =P(Z<(1.08-0)/1) =P(Z<1.08) =0.5+0.3599 =0.8599 is this correct?
13. ### Difference powerlaw, lognormal and streteched exponential (Weibull) function

I am currently fitting above mentioned functions to my data and I can observe, that both lognormal and Weibull are better fits than powerlaw. In literature, it is often suggested, that it is hard to distinguish these functions, but I can in my data. I do not completely understand the...
14. ### Normal Distribution

I cant figure out how to do this problem: I have 2 sets of means and 2 sets of SD 1sth graders scored a mean of 25 and a sd of 5 5th graders scored a mean of 30 and an sd of 10; assume the distributions are normal How do i figure out what percentage of the first graders scored better...
15. ### Help with the Beta Distribtuion

Background: I'm currently trying to learn how to use Bayesian Analysis for split testing two sets of binomial data. (Web analytics, Multi-Armed Bandit approach, etc). The Beta distribution kept coming up in this research, so Im trying to understand and apply it better. So, the best...
16. ### What asymmetric distribution represents this data?

Hello, I have this data: Bin particle_240 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 10 2 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 1 19 3 20 1 21 2 22 3 23 10 24 8 25 6 26 5 27 7 28 14 29 11 30 14 31 14 32 16 33 17 34 12 35 17 36 16 37 17 38 26 39 19 40 26...
17. ### Does vce(robust) correct not normally distributed errors (dependent variable)?

Hello everyone, I have a question regarding the vce(robust) command in Stata. I have used this command for dealing with heteroskedasticity. I have also found that the residuals of the dependent variable are not normally distributed. I used pnorm, qnorm, kdensity and swilk commands for...
18. ### Software to Determine Data Distribution

Does anyone know of any statistical program that takes a set of empirical data and determines what probability distribution it most closely matches? This would be ideal if a package existed in Python or R. Thanks for the help! -Ben
19. ### Distributions and means - confidence interval question

Hi folks, :wave: I think I did my research but I would like to be sure before continuing. My task is to find the mean price of a given item in a given country and I need to know how accurate my sample mean is vs. the actual population mean. Here is what I have. (My proposed, probably...
20. ### Sampling Distributions help

Hi, I'm teaching myself stats but have no idea on how to solve these, any help would be appreciated. When a pizza restaurant’s delivery process is operating effectively, pizzas are delivered in an average of 45 minutes with a standard deviation of 6 minutes. Suppose each night, 9 deliveries...