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.

learn more… | top users | synonyms

0
votes
2answers
40 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 ...
0
votes
0answers
6 views

- Make the frequency distribution [closed]

Using the data in the table below, do the following: - Make the frequency distribution. Begin at 0 and end at 22 using 11 intervals. - Graph the frequency histogram. Q2.
1
vote
1answer
20 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? ...
0
votes
0answers
34 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 ...
4
votes
1answer
150 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: ...
1
vote
1answer
66 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 ...
0
votes
0answers
6 views

r does not show specified dates on x-axis [migrated]

I used the following to generate a histogram ...
0
votes
0answers
6 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 ...
0
votes
0answers
9 views

Plot histogram using ggplots to be similar as hist() in R base [migrated]

I am new with ggplot2. I am using it to plot a histogram. Here is the code ...
6
votes
1answer
102 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 ...
5
votes
2answers
322 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 ...
2
votes
1answer
43 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 ...
2
votes
1answer
96 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 ...
2
votes
2answers
79 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 ...
4
votes
0answers
47 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 ...
2
votes
1answer
110 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 , ...
2
votes
1answer
36 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 ...
0
votes
0answers
35 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, ...
1
vote
0answers
32 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 ...
4
votes
3answers
203 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 (...
2
votes
0answers
67 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 ...
1
vote
0answers
60 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 ...
1
vote
1answer
47 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 ...
0
votes
0answers
47 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 ...
1
vote
0answers
20 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 ...
1
vote
2answers
24 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 ...
3
votes
2answers
463 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. ...
7
votes
2answers
126 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. ...
2
votes
0answers
246 views
0
votes
1answer
40 views

Chi-squared two sample test for unbinned discrete data

I am wandering through the net but I cannot get a precise description of how to solve this simple task. Two sets of datas ...
1
vote
1answer
36 views

Evaluate overlap of two histograms which are normalized to area 1

I have two normalized histograms which are normalized to area 1. They have different bin widths and forms. They only thing which they have in common is their area which is 1. Can someone explain me ...
1
vote
1answer
49 views

Comparing sets of noisy discontinuous curves / histograms

I have a dataset composed of measurements of signal intensity along a line; visually they look roughly like the right half of this: Each sample is a discontinuous "curve" composed of roughly 600 ...
0
votes
0answers
22 views

Kullback-Leibler Divergence of 2 histograms: Bin width issue?

I am calculating the distance of 2 histograms using Kullback-Leibler Divergence (KLD). Of course, the number of bins of 2 histograms are the same. However, I have a question about the bin width of the ...
0
votes
1answer
33 views

Ways to test bar charts with few bars to see if they come from the same distribution?

I have survey data with ordinal/categorical data. Most of the time the answers to question are Yes/No. I want to compare the bar charts (normalized) of yes/no from participants who gave a particular ...
1
vote
1answer
45 views

(Frequency Histogram) - Bins of equal width [duplicate]

How do I create 5 bins of equal width to plot a frequency histogram of the following sequence of numbers? 0.15 0.54 0.23 0.65 0.36 0.15 0.87 0.65 0.90 0.64 0.74 0.98 0.96 0.74 0.82 0.91 0.19 This ...
0
votes
0answers
27 views

Difference between two vectors of unequal size

I have a predictive model function mPred and two different input variables matrices of the same size (nxm), iM1 and ...
2
votes
3answers
194 views

What is “the shortest half of the data”?

Here is a histogram (realized with JMP) displaying two types of box plot called outlier box plot and quantile box plot. Right below, there are a bunch of explanations of the meaning of the ...
0
votes
0answers
59 views

histograms/ kernel density estimation for proportion data

I am looking at digital advertising data with the following columns: site_id | impressions_count| clicks_count. I am interested in a histogram of the click through rate (clicks/impressions) across ...
0
votes
0answers
13 views

Histograms With No Final Interval Upper Limit

If you have the following histogram, how do you calculate the mean if you do not know the upper limit of the final interval: ...
2
votes
2answers
307 views

Optimal bin width for two dimensional histogram

There are lots of rules for selecting an optimal bin width in a 1D histogram (see for example) I'm looking for a rule that applies the selection of optimal equal-bin widths on two-dimensional ...
1
vote
1answer
181 views

Fitting exponential curve to histogram using R

I am trying to fit a curve to a histogram that looks roughly like exponential decay. Since this is roughly similar to exponential decay, I figured a good model was ...
2
votes
1answer
295 views

Rank histogram (or Talagrand Diagram) of precipitation data

Given a dataset of lines containing 6 wind forecast values plus 1 observed (actual) value in each like: ...
2
votes
3answers
949 views

Comparing two histograms

I would like to know what are the common techniques to compare two histograms? I have histogram of two images and I want to see are they similar or not meaning that is there any correlation between ...
1
vote
0answers
23 views

Methods for 3D histograms comparison

When I wish to compare 2D image histograms I can use methods like Chi-Square and Intersection but what are my options if I wish to compare 3D histograms (e.g, based on R,G,B values)? Thanks.
0
votes
2answers
382 views

Plotting a Gaussian in Python

I am trying to plot a histogram of my data, and I seem to be a little confused here. I am using matplotlib in Python. Here is the code from their website: ...
2
votes
1answer
78 views

How to measure the magnitude of difference between two gaussian distributions? Specifically with rates of DNA mutations

As the title says I want to quantify the difference in the rates of sequence change between genes. When I measure the mutation rates between my subgenomes I can determine a significant but slight ...
1
vote
0answers
107 views

generate frequency distribution from database

In a MySQL database there's a table with a single numeric value column. I want to plot the distribution of these values as a bar chart/histogram with the following ...
1
vote
0answers
8 views

Select most different observations

I have a polar chart representing eight dimensional observations as 'rings' around the center. Furthermore, I am limited to Excel for graphing purposes, which means I can only display 255 series at ...
3
votes
0answers
41 views

10% dip in February for metrics that count?

February usually has 28 days, unlike it's neighbors January and March which have 31. It seems that most countable things will exhibit, on average, a 10% dip in February for the missing 3 days. This ...
0
votes
1answer
51 views

Quantifying Change in a Histogram Valued Timeseries

I'm attempting to do binary classification where my raw features are collections of histograms that are recorded in a time series. These histograms are scaled to sum to 1. To be more precise and ...