Questions tagged [distribution-identification]
Questions about recognizing a probability distribution from a figure, formula, or text description. Please use a specific, informative title.
55
questions
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Help selecting a correct distribution for this data
I'm a geologist working with some sparse borehole data. The boreholes sample igneous intrusions and we're trying to fit a distribution to the thickness of the intrustion vs frequency (for use in other ...
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31 views
What probability distribution would be look like this?
I was playing with R, I started with adding consecutive binomials (the n parameter of the second binomial variable depends of the result of the first binomial and so on...). After a few more ...
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1answer
37 views
Help finding the type of distribution
I am doing a question which involves the following probability density function
$$f(x;\mu,\lambda) = \sqrt{\frac{\lambda}{2\pi x^{3}}} exp\bigg(\frac{-\lambda(x-\mu)^2}{2\mu^2x}\bigg), x>0, \lambda,...
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31 views
What distribution could the data stem from?
From checking the histogram of the distribution I had the intuition that the data could follow a Poisson or an exponential distribtuion.
However, Lilliefors test that the data is exponentially ...
3
votes
2answers
77 views
Estimating the blockchain mining time for $N$ nodes
I am trying to simulate a set of times for the below problem.
There are N nodes. Each node generates a random number($R$) in the range $[0,K]$ per second. Guess the time it takes by each node to ...
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22 views
Test for statistical distribution
I'm new to statistical analysis and I'm trying to identify which distribution fits my BD better. My BD has length of stay (LOS) data in two different hospitals: ...
11
votes
2answers
712 views
What kind of distribution does this have?
Currently I'm trying to figure out the distribution of the following:
$X \sim \frac{\sqrt{n}}{\sqrt{Gamma(n,\beta)}}$ where the denominator follows a $Gamma(n,\beta)$ distribution.
I've checked out ...
1
vote
1answer
16 views
calculate mean of normal distribution given SD and probability corresponding to a single range
Suppose that I have a normally distributed variable with unknown mean and known SD: $X \sim N(\mu, 1)$. I also know that $P(-2 < X < 2) = 0.3.$ Is it possible to calculate $\mu$ from this ...
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64 views
Is there a way to find a statistical distribution for the below data?
Is there a way to find a statistical distribution for the below data?
This is derived from frequency count of different topics in a large corpus of news stories. I wonder if this follows a Poisson ...
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0answers
27 views
What's the name for a distribution where at the extreme there are more values farther away from the mean than closer?
The image below from this blog provides a good example. I'm talking about distributions that are roughly Gaussian except that there are more values at the high end that would be expected. In ...
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0answers
55 views
QQ plot distribution check
I want to check if a distribution is log normal or not by using qq plot. So for convenience I am creating a
lognormal distribution using stats and checking it in ...
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40 views
Are there any methods to test whether a data set obeys a certain probability distribution?
If one has a set of data, are there any methods or techniques of testing whether that set obeys a candidate distribution?
I have thought of a number of possibilities:
Simply histogram and look at it, ...
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1answer
69 views
What is the name of this distribution?
I came across this: a categorical distribution with $K=10,000$ parameters (categories), and we take only few samples from this distribution, say $N=400$ (the point is $N < K$). Now, obviously, not ...
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65 views
How can i find a suitable distribution that fits my data?
I have some data on prevalence of a given infection, provided for each country for 6 different age groups. I am trying to find a suitable distribution that may be suitable to model capture the ...
0
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1answer
205 views
Compare distribution to given shapes to find the most similar
I have a multiple comparison problem between some thousands of correlation distributions and given shapes.
I have computed pair-wise correlation for a given set of gene expresion data, and I have ...
12
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1answer
223 views
Name for a distribution between exponential and gamma?
The density $$f(s)\propto \frac{s}{s+\alpha}e^{-s},\quad s > 0$$ where $\alpha \ge 0$ is a parameter, lives between the exponential ($\alpha=0$) and $\Gamma(2,1)$ ($\alpha \to \infty$) ...
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2answers
246 views
Can anyone suggest a distribution for this histogram
I have some data and I am trying to identify its distribution. The nearest I can get is a skewed-Gaussian distribution, but I don't think it is. The data itself consists of 130000 points and is binned ...
3
votes
1answer
138 views
Name this distribution!
While looking for a link function for my model I realized I cannot find a good fit for the distribution of my Y (see fig. below).
It is the distribution of number of offspring for a given season, the ...
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2answers
5k views
Understanding the Cullen and Frey plot
I would like to figure out which distribution fits my data best.
Here is the histogram of my data :
I used the fitdistrplus package in R to try to find the best ...
3
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2answers
289 views
What does the distribution of bootstrapped values in this Cullen and Frey Graph tell me?
I am trying to find a suitable distribution to describe my data, and as one of the first few steps I created a Cullen and Frey Graph using the descdist command from ...
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0answers
22 views
Identifying the best fitting distribution type to test
Hi I tried to analyze a dataset, of USDT concurrency and following is the frequency distribution I received for log return
I need this dataset to fit for a particular distribution. Can we suggest ...
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vote
3answers
691 views
How to determine which distribution fits my data set?
I have this data set which I am trying to find which distribution my data set can be accurately represented by using r. I performed the Shapiro-Wilk test and found that my data does not come from a ...
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0answers
39 views
Identifying the distribution of this data
I'm working with a datetime series, and each observation is the count of occurrences per that period. This sounds to me like these values would be Poisson distributed. But my EDA has left me ...
2
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3answers
114 views
How long is a distribution considered normal?
I have a dataset of metric distances ($n=5800$) and plotted those as a histogram. My initial thought was that this distribution looks normal. But after performing a Shapiro Wilk test and plotting the ...
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1answer
400 views
Is there a common underdispersed discrete distribution with unbounded support for general mean and variance?
I have a mean $\mu$ and a variance $\sigma^2$ with underdispersion, i.e., $\sigma^2<\mu$. Is there a standard discrete distribution with these moments and unbounded-on-the-right support, i.e., ...
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1answer
86 views
What kind of distribution is this?
I'm sorry is this is too obvious, but I'm having a hard time trying to find a distribution for my data. It is clearly not a normal distribution. It does not seem to be skewed, but seems to have fat ...
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votes
2answers
94 views
What kind of frequency distribution is this?
I have a discrete frequency distribution, that looks like this
I am trying to find what type of distribution is it?
I looked at many models but it does not seem to comply with any.
I have 345 ...
2
votes
1answer
122 views
Are the data in this figure normally distributed?
What kind of distribution is figure 2 in this study? If it's a Gaussian distribution for the LH hormone, I can't make any sense of the data.
The article:
Aksglaede, L. et al. (2009): Recent decline ...
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0answers
63 views
Identify the underlying distribution from multiple samples
I have $30$ unequal samples ($n_i >1000$) from a supposedly same population. How should I go about identifying the underlying distribution of the population using these $30$ samples simultaneously?
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27 views
Distribution of relative proportions of draws from two uniform distributions
Drawing samples from 2 uniform distributions and calculating pairwise proportions of drawn values gives rise to a distribution I cannot recognize. What distribution is this?
...
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0answers
128 views
Determining the distribution of data
Hi, I am a student learning financial modelling. I would like some help in determining the distribution of the data given the plots above. I am reluctant to assume normal distribution of the data due ...
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0answers
735 views
If this is a log normal distribution, how can I fit it?
The qualified question title hints at my not being certain as to what I'm really dealing with. I have some truly random samples that generate the following graph. This is just a small extract and ...
2
votes
2answers
158 views
How to determine the distribution iof this transformed variable $X_c = X ({1_{\{|X|>c\}}}-{1_{\{|X|\le c\}}})$
I have one question from econometric class which asks to find the probability distribution of the following:
$$X_c = X ({1_{\{|X|>c\}}}-{1_{\{|X|\le c\}}}) $$
where $X \sim N(0,1)$ and $c > 0$...
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1answer
126 views
KS, Anderson-Darling and Cramer -Von Mises don'y work on these data . Why? [closed]
I am using Mathematica to model the distribution of the data below and I test the fits with AD, CVM and KS but none of them seems to work I was told that my data may have an excessive amount of ties. ...
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2answers
2k views
How to determine the type of probability distribution for a dataset?
I have aggregated(total) youtube videos views. I have take log of that views. And calculated autoregressive koefs that can be used for the video views predictibility tests. Let say I have aggregated ...
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0answers
55 views
Looking for a good distribution to analyse market dynamics
I'm experimenting with replacement for normal distribution for my models.
So far, I tried Gamma and Inverse Gamma distributions. Gamma significantly underestimates the probability of the extreme ...
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0answers
242 views
What distribution should my data on sales follow
I'm a chain store and have many stores across the country that all sell a particular shampoo product P.
I have made a plot as shown in the image below. For example, 30 stores each sold 1 of P in the ...
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votes
3answers
238 views
What kind of distribution is this? (Number of stones until 2 are adjacent in a game of Go)
I've plotted the histogram of the number of stones required so that 2 are adjacent when randomly placed 1 by 1 on a goban (think of a 19x19 chessboard and I place pieces 1 by 1 until 2 are adjacent, ...
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votes
3answers
1k views
Does this distribution have a name? $f(x)\propto\exp(-|x-\mu|^p/\beta)$
It occurred to me today that the distribution
$$
f(x)\propto\exp\left(-\frac{|x-\mu|^p}{\beta}\right)
$$
could be viewed as a compromise between the Gaussian and Laplace distributions, for $x\in\...
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0answers
306 views
Distinguish between distributions
I have the following data frame and want to know what distribution is consistent with it.
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1answer
362 views
Right angled Triangular distribution
I have an empirical probability distribution which looks somewhat like a right angled triangle. I am trying to model a process which relys on a semi accurate model of this distribution.
There isn't ...
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0answers
64 views
Any one knows what the distribution with density $\frac{{x{e^{ - \frac{{{x^2}}}{{2t}}}}}}{{\sqrt {2\pi {t^3}} }}$ is?
As the title, any one knows what the distribution with density $f(x)=\frac{{x{e^{ - \frac{{{x^2}}}{{2t}}}}}}{{\sqrt {2\pi {t^3}} }}$ is? Thank you!
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1answer
127 views
What distribution is this? (time until task completion and submission)
I am looking at submission data—the length of time it takes for someone to complete a flow which involves submitting an item of content. I am getting the following distributions. I have two ...
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0answers
329 views
Distribution with a given moment generating function
As a follow-up to a question on a central limit theorem for independent random variables (r.v.) here, let $Y_j=-\log(1-V_j)$, where $V_j\sim\mbox{beta}(1-\sigma,j\sigma)$, $j\in\mathbb{N}^*$, $\sigma\...
161
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2answers
216k views
How to determine which distribution fits my data best?
I have a dataset and would like to figure out which distribution fits my data best.
I used the fitdistr() function to estimate the necessary parameters to ...
2
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0answers
33 views
Is there a name for this simple discrete distribution? [duplicate]
I'm just wondering if there's a name for the distribution described by the following p.m.f.:
$$p(n) = n(1-s)^{n-1}s^2$$
where $n$ is an integer from $1$ to $\infty$ and $0\lt s\lt1$.
2
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1answer
27 views
Modeling Smooth Decay on Logarithmic Y
I have an empirical distribution that looks like the the image below and I hoping to model it with some parametric distribution. The X axis measures "number of ...
4
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1answer
280 views
What is this distribution? (time-delays between two events)
I have a right-skewed distribution that has this qq-plot against a normal with the same mean and standard deviation:
The data are time-delays between two events. Also, this is the histogram of the ...
2
votes
1answer
208 views
What is this distribution? $(x-1) \theta^2 (1-\theta)^{x-2}$
Does anyone know what the following distribution is, please? I can tell it is discrete and $\theta$ is somehow a probability. Thank you!
$$\mathbb P_X(x; \theta) = (x-1) \theta^2 (1-\theta)^{x-2}, \ \...
0
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1answer
194 views
The number of times a CI contains the true value: What distribution does this follow?
Suppose we repeat an experiment identically and independently 100 times. Each
time we construct a 99% confidence interval for $\mu$ via the t-distribution. Let X =
the number of times the confidence ...
