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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What is the purpose of multiplying by the difference between the midpoints of two bins in this recipe?

While browsing for information on how I might plot a fitted normal curve over a histogram, I found the following: http://www.statmethods.net/graphs/density.html There is a line I don't fully ...
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25 views

Calculating uncertainties for histogram bins of experimental data with known measurement errors

I have a set of experimental data (with each data-point having its own measured uncertainty), and I wish to produce a histogram of it. The x values of the edges of each bin are already defined. The ...
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47 views

Can you test for normality for a (0,1) bounded distribution?

I have a vector of observations called MyData which is a percentile score that is >= 0 and <= 1. I would like to test the ...
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30 views

Histogram bin size to show deviation from uniform distribution

Simple question: Is there a rule of thumb for number of bins in a histogram with a uniform distribution? Details: I have a stochastic computer simulation that produces, as a test, $n$ values that ...
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7 views

Which search algo I should use to find simmilar histograms inside my huge database?

I'have a huge database of about 10^8 objects. Every object contains max. 500 words from a dictionary with 50000 words (BoW). An object from my database could look ...
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39 views

Is this histogram normally distributed?

Is this histogram normally distributed? I can't tell since there are peaks that are outside the curve.
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605 views

What is the name for the distribution shape of a histogram with this kind of curvature?

I have a histogram of points with a dip in the center of the bell, seeming to create two bells, or two clusters. What is the name for this kind of shaped distribution? This curve should be normal but ...
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2answers
30 views

How to determine the similarity between histograms

The questions is asked at How to assess the similarity of two histograms? However, I'm not sure if it's the same question as mine, so I'd like to ask again. I have a dataset, which covers a long ...
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60 views

How to better plot and compare overlapping histograms?

I want to compare the distribution of 3 different time spans: So I plot the histograms together, along with the model curve. But I'm afraid that overlapping histograms makes each hard to see. The ...
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24 views

Simple question concerning the argument “breaks” of hist() [migrated]

When I run > hist(precip, breaks = 10) I get the following histogram: According to the document, breaks is "a single ...
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5 views

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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16 views

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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1answer
32 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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13 views

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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33 views

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
85 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
79 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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372 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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53 views

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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21 views

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
49 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
27 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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61 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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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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77 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
40 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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7 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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101 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
104 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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22 views

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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50 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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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
36 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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15 views

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
65 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
95 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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44 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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16 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
835 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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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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1answer
75 views

What type of distribution is this?

What kind of distribution is the one reported here below?
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27 views

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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59 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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30 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
33 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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135 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 ...