A histogram is a graphical representation of the frequencies of a continuous variable. The variable is divided into bins and a bar is drawn for each bin, proportional to its frequency in the data.

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Figuring out distribution parameters for specified modes

I'm trying to find out, which parameters $\alpha_i$ should Dirichlet distribution have in order to have as modes some specified $x_i$. The formula for mode for Dirichlet distribution is this (from ...
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How do we normalize a set of histograms?

I have 100 histograms which have different (min,max) ranges. Each histogram is of 127 bins. What is the procedure ti normalize these histogram? Need help...
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30 views

Reference for known issues with histograms (binning, anchor point)

I'm looking for references on the known issues that arise when working with histograms, i.e.: the choice of the number of bins, and the choice of the origin point. The WP entry on Multivariate kernel ...
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Adding Title to Histogram in a Function [migrated]

I made a simple function to automatically plot all variables in a dataframe. Below is the code, ...
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Comparing count groups/hisotgrams with different bins

I'm looking at clustering techinques for which I have a ground truth. From the ground truth I can extract the cardinality (size) of clusters and I would like to test how well different methods can ...
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12 views

Bird eye view of unknown data set [duplicate]

Pardon me if this question does not fit this site (or SE engine in general) but I do not know where to post it. Suppose that you have unknown data set which you want to explore. What ...
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I need help to determine the distribution

So I have an assignment to estimate the distribution of different sets of and then make a goodfit test to see if the assumption is correct. This is my current histogram, and I have tried both ...
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3answers
82 views

Verifying that a random generator outputs a uniform distribution

I asked a student of mine this question: If you have a random number generator that outputs a number between $1$ and $k$, how would you write a test that decides whether the generated ...
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1answer
73 views

Why aren't bivariate histogram matrices as common as scatter plot matrices

Bivariate histogram matrices give me intuition which categorical variables are related to one another. For example: I can easily see which variables are related to one another. Indeed, this ...
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3answers
47 views

Transformation of specific data

I need help with data transformation. In the picture below the upper left picture shows the histogram of the variable V6. Because it is so right-skewed I tried 3 forms of transformation but none of ...
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355 views

What information does a Box Plot provide that a Histogram does not?

Histograms give a good sense of the distribution of a variable. Box plots attempt to do the same thing however, don't give as good of a picture of the distribution of this variable. I don't ...
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What kind of distribution is this? Many trials and guess the distributions for different settings

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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Evaluation of a group of histograms

I'm trying to learn statistics on my own and currently taking an online class through edX. Unfortunately some things are not clearly explained. The online book used for this class contains the ...
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2answers
46 views

Error of empirical probability for unfair die

I roll an unfair $256$-sided die $n$ times ($n > 1'000'000$) and count the rolled numbers in a histogram. I then calculate the empirical probabilities ${p_e}_i$ for $i=1, ..., 256$ by taking the ...
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1answer
21 views

Fit a function f on dataset X such that f(X) fits a histogram

I have dataset $X=\{\boldsymbol{x_1},\boldsymbol{x_2},\dots,\boldsymbol{x_n}\}$ and $Y=\{y_1,y_2,\dots,y_n\}$ and want to learn a function $f$ such that $y = f(\boldsymbol{x})$ can be approximated as ...
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1answer
58 views

How to apply distance metrics to compare bar plot (nominal histogram) data

I have a data set for libraries, I would like to find the (Similarity / dissimilarity) among it based on book category, so for each category there is single value represent the number of books that ...
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15 views

Why are there lines in my scatterplot: regression standardized predicted value -regression standardized residual [duplicate]

I used SPPS for creating this scatterplot,I made it like this: analyze – regression- linear – plots: y: ZRESID en bij X: ZPRED The dependent variable is social anxiety The independent variables are ...
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3 views

inequal amplitudes and opened classes

i have to questions and i need the help of experts 1)In the case of inequal amplitudes, is the sum of the corrected frequencies is equal to unit? 2)In the case where the extreme classes are opened , ...
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15 views

How to find a linear dependency in a 2-D histogram?

I have a matrix (average of several trials), with x and y as independent variables, and z as dependent variable. It can be plotted as a 2-D histogram. Now I want to detect if there is any significant ...
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2answers
57 views

how to measure similarity of two lists of continuous data with different length

I have two lists of continuous data with different length. a) How should I measure (dis)similarity of these two lists? or, as these lists can be formed into histogram, how can I quantify ...
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1answer
39 views

which classifier to choose for probability histogram-like features

I have a populations of 500 elements. Each element is represented by a 10 dimension feature vector which sum of element is equal to 1 (you can think about it as a histogram of probabilities). In ...
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6 views

Quantization threshold selection

I have the 256-bin histogram representing a distribution of the values taken by a certain descriptor element. This descriptor element takes the values in 0-255 range, hence 256 bins. I want to ...
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95 views

Paired t-test vs Wilcoxon signed rank

I conducted a pilot study (n=14) which was evaluated retrospectively. I have four parameters with a pre-intervention and post-intervention score that I want to compare. I am wondering whether I can do ...
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2answers
98 views

Sample from distribution given by histogram

Given a histogram obtained using given data points, how do I randomly sample from the distribution predicted by the histogram? Any conceptual comment / R code would be welcome.
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Computing 'histogram' similarity when the elements can be positively or negatively weighted

The 'histograms' I want to compare may have positive or negative bin-values. I use the quotes because I am not sure histogram is the correct name. The elements that are being sample have associated ...
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42 views

What kind of distribution is my QQ-plot and histogram?

I am pretty in new in distribution issues and I am trying to figure out what kind of distribution I have. I have a historical data with more than 300 observations. I will calculate Value-at-Risk ...
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1answer
45 views

Non parametric density estimation

In general it's possible to estimate a given multivariate density function $f(x)$ using some non-parametric methods such as kernels or histogram. What are the conditions on a function $g$ such that ...
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1answer
31 views

How to recursively normalize my histogram count

I need to scale my histogram as I cannot store them with large numbers. Hence, I need to normalize it. I have taken normalization factor as sum of total population. But this need to happen ...
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using histogram distances for clustering

Business context: for our retail client there are a few crucial products. All of them have 3 phases (introduction, stable phase and end of life). After correcting for seasonality and discounts (as ...
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1answer
57 views

Right skewed asymmetric Gaussian-like distribution

I am trying to find a possible candidate as a fitting function for a distribution that looks like the following I know that this isn't a straightforward question, but I would like a simple function ...
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1answer
90 views

Why are histograms often filled?

Many histogram functions part of scientific analysis software has the default configuration to fill the histogram. Examples are Matlab and Matplotlib. On the other hand, the default for line plots ...
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40 views

Assess moments & normality of data from histogram

I have produced a histogram of my actual data; then I plotted its normalized graph on the same plot. How can I compare the first four moments (mean, variance, skewness and kurtosis) of the actual data ...
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15 views

How classify output of a composite indicator using fuzzy concepts?

Suppose that we created a composite indicator to compare a company branches performance in a country. This company has 5 current levels for performance. This is histogram of composite indicator output ...
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1answer
504 views

Comparing two histograms using Chi-Square distance

I want to compare two images of faces. I calculated their LBP-histograms. So now I need to compare these two histograms and get something that will tell how much these histograms are equal (0 - 100%). ...
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25 views

Q-Q Plot for Simulation Study with Bernoulli Data Issue

I'm currently trying to carry out a simulation study for Bernoulli Data to show that the sample proportion, ˆp, is also approximately normally distributed when the sample size is large. From an ...
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71 views

What type of distribution is this?

What kind of distribution is the one reported here below?
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On fitting a Poisson distribution to make sense of data

Hi guys I am working with a regular network which has the shape of a square grid and contains 100x100=10000 nodes. The edges (links) between these nodes simply ...
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54 views

How do i compare histograms?

I have not learned chi^2 yet,but I need to compare two histograms. How do I go about doing that? My AP Statistics Project is due Friday and I have asked my teacher but I am not entirely sure what to ...
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27 views

Finding a representative upper limit of a large dataset

I have summer cumulative solar radiation data derived from a model on an area in North-West Italy. I extracted the modelled values from specific regions (i.e. within rock glaciers outlines), obtaining ...
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1answer
32 views

Classifying histograms in N dimensional space - is my aproach correct?

I have a problem which consists of classifying N-dimensional histograms. The salient points are as follows: For ALL dimensions: Each histogram has the same number of bins (say 500, for argument ...
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130 views

How to perform logarithmic binning

I'm trying to program (in C++ if relevant) some functionality to plot a histogram that does logarithmic binning. The range of values run from 0 to M (there is a possibility for negatives but we're not ...
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1answer
57 views

About multiple samples and histogram

If we take multiple samples of a process and draw a histogram of the sample: does the range reduces as the sample size increases does histogram form a normal distribution does the sample ...
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59 views

Inference of frequency of values in a poisson distributed histogram

For some data there is a histogram, which has bins with varying sizes. Is it possible to infer the frequency of the values for smaller segments of the bins, favourably with Matlab? With the attached ...
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42 views

Optimizing probability density function binning

I have a probability density function which has the range of -103 to 117 with 220 bin. I would like to minimize the bin point preferably less than 20 bin that will still capture the shape of the ...
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Select a fittting model for histograms varying the number of Gaussians

I have many data in the form of one dimensional histogram, to give an example consider the data at http://pastebin.com/embed_js.php?i=1mNRuEHZ I expect that these data are obtained from a pdf ...
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Interpreting steep histogram, fitting distribution

I'm trying to fit the distribution to the data. I started with histogram. Note that y axis is in logarithmic scale since the histogram is very steep. How should proceed to find actual ...
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2answers
90 views

The frequency in histograms

My question is trivial, but the problem is that I found contradictory answers on internet. So I have the following sample data: ...
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1answer
107 views

Why is my density plot just a line on the bottom?

Basically, I'm just trying to plot a curve over my histogram for the weight of a few students. lines(density(weight), lwd = 2, col = "red") However, what I get ...
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34 views

Creating a Histogram from data that is already binned [closed]

I am new to using R, and was hoping to get some help. I was given data that is already binned, and bins are not of equal length. I have summarized the data as follows ...
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53 views

Histograms with similar means but different appearances

I have two histograms shown below. As you can see, the two histograms are different in appearance. However, when I calculate the mean of the two histograms, they are pretty similar. The mean for ...