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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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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18 views

Efficient way to summarise, re-group and plot data set of group frequencies in R [migrated]

I have a set of data for three groups (A, B, C) which gives information on how often a certain value "x" (between -3 and +3) is observed for that group (0 to 100). To give a simplified example: ...
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13 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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24 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 ...
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25 views

Eliminate zero counts bin from histogram [closed]

I have an histogram of a random variable X1 with some zero counts bins: ...
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21 views

How to characterize opposite of heavy tailed distribution?

I have a bunch of histogram distributions. In some of the histograms (let's call these Type-A), the initial 2-3 bins are extremely tall compared to the remaining bins. In others, there is no ...
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141 views

How do you find a cutting point / strong slope within one-dimensional data

I have one-dimensional data. I want to find possible natural cutting points (strong slopes) within the data. For instance, if the data is ...
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25 views

Are there any metrics that return only scalar quantities for comparing two histograms?

I have multiple 20x20 matrices that represent histogram distributions. I want to compare these matrices with one another, and I'd prefer a metric that would return a scalar metric that correlates to ...
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37 views

Is there a general/golden rule for appropriate binning in a histogram?

I was wondering, is there a general rule or a "golden rule" that sets the appropriate bin size as a function of statistical parameters such as sample size, mean, median, mode, standard deviation, etc. ...
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70 views

Histogram binning approach to find the pdf and log-likelihood expression?

There is a paper : Presles, B., Debayle, J., Cameirao, A., Fevotte, G. and Pinoli, J.~C., Volume estimation of 3D particles with known convex shapes from its projected areas, IEEE International ...
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1answer
34 views

Histogram in JMP 11 [closed]

While plotting histogram in JMP 11, the option to set the bin width is not available. I also tried doing it with the axis settings, but the X-axis setting is disabled (X-axis has the variable values ...
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30 views

How to determine similarity between histograms? (Which metric to use?!)

Hello Stack Exchange community, I'm relatively confused on what to do in this scenario. I am running an experiment that retrieves data of interest and stores it as an array. Experimental conditions ...
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26 views

histograms for repeated measures

I have a repeated measures data set where each variable is measured at several time points.That is say I have 20 subjects in my sample. Each subject is measured for three time points. (There are some ...
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40 views

Is this a multimodal distribution?

This histogram is part of a task about descriptive statistics. I thought it would be easy, and it is, but i am not sure about this one. First I described this histogram as slightly positively skewed. ...
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1answer
57 views

Researching the frequency stability property

I have seen this short, wonderful video about the frequency stability property (also there is another video from this guy under his Kickstarter project ArtOfTheProblem; they are both great, and I ...
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49 views

Using Dirac Delta functions for estimating a probability distribution

I'm having some trouble understanding this slide. It's mentioned in the context of gaussian distributions. I sort of understand the Dirac delta "function". The main difficulty I'm having is with ...
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39 views

Make 2D color histogram with uniform distribution (Likert scale)

UPDATE: I've been told that I cannot specifically ask for help in regards to the programming (MatLab and PR Tools), but instead should seek help for general techniques. So that's what I'm doing. Long ...
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24 views

Error on histogram computed on autocorrelated time series

I am struggling to find an answer to this quite basic question. When computing a histogram on a time series which has some correlations (i.e. measurements are not independant), how to estimate the ...
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54 views

Knuth rule for number of bins of a histogram vs. chi2 fitting

I try to make a histogram and then fit some distribution to it by means of chi2. The Knuth rule (I have some bimodal cases so I'm not using Freedman-Diaconis or Scott) gives me the following histogram ...
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66 views

What is the difference between simple histogram and histogram LBP?

What is the difference between a simple histogram and a histogram LBP (local binary pattern)? Can someone provide the intuition behind histogram LBP?
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15 views

what is the drawback of DLBP(Dominant local binary pattern)?

Although the DLBP features encapsulate more textural information than the conventional LBP features, they lack the consideration of distant pixel interactions. The reason is that the binary patterns ...
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103 views

How to plot mean plus/minus standard deviation for histograms?

I have a set of grayscale images, where the pixels may have values in the range $[0, 255]$. From each image, I calculate a histogram, which shows how many pixels have the value $0$, $1$, $2$, and so ...
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29 views

What is the difference between LBP and DLBP?

if the Local binary pattern(LBP) is efficient approach why came Dominant local binary pattern(DLBP).i need your help
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26 views

How to distinguish histograms having two distinctive peaks?

I have two categories of histograms, one of them has two very distinctive peaks (not necessarily at the same bins/locations every time). What might be a good algorithm/method to find out such ...
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1answer
42 views

Histogram in R from two vectors [closed]

how can I create a histogram in R from known values and counts? Thing is, I need to change manually h\$counts in my data set, so I have no data for that new histogram with changed values in h\$counts. ...
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48 views

How to show that a dataset does not contain significant outliers?

I have largish dataset: there is 200 variables and 100 samples. How could I show that the dataset does not contain any significant outliers? All variables have the same unit (millimeters) and have ...
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126 views

Calculating Mean and Standard Deviation From Frequency Chart

I have only a frequency table like that below. How can I get the mean and standard deviation? ...
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42 views

Histogram of a vector

I need to implement an algorithm that plots an histogram of a vector containing N values. Those values are all calculated by an simulation, so, as we can note, we should obtain values like 3.45543 and ...
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195 views

Comparing and visualising highly skewed distributions

The data I'm working with are highly skewed, with the vast majority of data concentrated at 0. It seems really hard to highlight the differences between these kind of distributions: ...
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79 views

Why do we use the histogram?

As somebody who never took a statistics course (but had to teach a few classes on it), I wondered why is the histogram introduced in a statistics course? Usually when something is introduced in a ...
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9 views

Divide Feature space into regions where distribution of response variable is as different as possible?

I am trying to divide a feature space with 7 variables in regions where the distributions of a response variable are as different as possible. I have been using Earth Mover's Distance as the distance ...
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322 views

Optimal number of bins in histogram by the Freedman–Diaconis rule: difference between theoretical rate and actual number

Wikipedia reports that under the Freedman and Diaconis rule, the optimal number of bins in an histogram, $k$ should grow as $$k\sim n^{1/3}$$ where $n$ is the sample size. However, If you look at ...
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389 views

Why doesn't my gamma density plot match my histogram of samples?

I'm confused as to why plot is showing such a steep curve for the gamma PDF. I thought that plotting the draws from an inverse-gamma should approximate the PDF, however it doesn't match the plotted ...
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1answer
61 views

Density estimation and histograms

This is an excerpt from BW Silverman's Density Estimation for Statistics and Data Analysis: The oldest and most widely used density estimator is the histogram. Given an origin $x_0$ and a bin ...
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1answer
572 views

how to determine skewness from histogram with outliers?

I have the following histogram created in Minitab. I am wondering whether this histogram is actually positively skewed, negatively skewed, or symmetric. By observing the graph itself, it seems that ...
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118 views

Comparing frequency distributions

Quick rundown of my data: I have depth measurements from fish with implanted transmitters from two sites (reference and hypoxic) and two seasons (spring and summer). All data is in an Excel ...
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158 views

KDE vs. histogram [closed]

I plotted KDE (Gaussian kernel) and histogram of a dataset and the result is a bit confusing How can I explain lack of a spike around 0 in KDE? I assume that I don't understand something related to ...
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1answer
131 views

Does this look like a Cauchy distribution?

This is my data there is more actually... but I just want to know if this looks like a Cauchy distribution, such as these: I'm asking about just that bump... here is the whole distribution , ...
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1answer
51 views

Choosing a line/plane to separate two classes of binned data

In high energy physics I know it is common task to find the best separation point between two classes of data, usually signal and noise. This separation point is usually determined by first binning ...
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112 views

Calculating the mutual information between two histograms

I've been set a sample exercise by my supervisor, and I'm totally lost as to where I should be heading. What I've been tasked with is to generate two histograms that approximate Gaussian PDFs. Then, ...
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52 views

Accounting for measurement bias using a histogram or violin plot and numerical data in R

The Problem I have a gardener whose job it is to measure trees in meters using a measuring stick. She measures the heights of 1,000 trees. I plot these measurements on a violin plot in R. I am ...
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4answers
626 views

How to test if my distribution is multimodal?

When I plot a histogram of my data, it has two peaks: Does that mean a potential multi-modal distribution? I ran the dip.test in R (...
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102 views

Where is the maximum bias and variance in a histogram as non-parametric density estimator?

I am a little bit confused about bias and variance of non-parametric density estimators and hope you can help me. Assuming a constant bandwidth and sample size, I am wondering at which points of the ...
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76 views

How to present multiple distributions with R?

I have a stochastic simulation on NetLogo in which my agents accumulate "wealth". Of course, every run gives me different outputs but with pretty much the same distribution. I use histograms to keep ...
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100 views

HOG blocks: adding histograms or concatenating histograms?

In Histogram of Oriented Gradients, the edge orientations within rectangular patches are binned into the bins of a histogram. Each pixel adds the strength of its orientation in the bin corresponding ...
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67 views

comparing probability histogram

I have two probability histogram samples. I know there are methods(i.e KS test etc) out there to compare histograms but I am trying to compare through simple sum of absolute difference between these ...
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22 views

Histogram of noncentral chi-square variable shoots up when the number of histogram cells increases

Consider the random variable defined by: $$y=-8x+108$$ where $x$ follow a non-central chi-square distribution with 1 degree of freedom and a non-centrality parameter equal to 3.5, $x \sim ...
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26 views

Revealing structure of clusters in a dataset

I have obtained values for the same parameter in various locations and I want to cluster them (abundance fraction of different minerals in a hyper-spectral image). These fractions have spatial ...
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2answers
1k views

If my histogram shows a bell-shaped curve, can I say my data is normally distributed?

I created a histogram for Respondent Age and managed to get a very nice bell-shaped curve, from which I concluded that the distribution is normal. Then I ran the normality test in SPSS, with n = 169. ...
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178 views

How to describe a bin in a histogram?

What is common in the literature to refer to a certain bin in a histogram? For example, say I have a histogram with 4 bins. The first bin has all values between 1 to 2, second bin 2 to 3, and so on. ...