Made with


Any histogram is known to be an accurate representation of the distribution of numerical data. Being an estimate of the probability distribution of a continuous variable, the histogram was first introduced by Karl Pearson as a kind of a bar graph. To make a histogram, you need to divide the range of values into a series of intervals and then to count how many of the values fall into each of the intervals. The so-called “bins” are usually specified as non-overlapping, consecutive intervals of a variable. Such intervals must be adjacent and they are often of an equal size.

In case the bins are of an equal size, a rectangle can be erected over such bin with a height that is proportional to the number of cases in each of the bins. Any histogram may also be normalized in order to display the so-called "relative" frequencies, showing the proportion of cases that fall into each of a few categories, with the sum of the heights which is expected to equal 1.

The mentioned bins don’t have to be of equal width. In such case, the erected rectangle can be defined to have its area proportional to the frequency of all the cases that are in the bin. The vertical axis is in such case is not called as the frequency but the frequency density. The mentioned density is simply the number of the cases per unit of the variable on the horizontal axis.

Giving a rough sense of the density of the underlying distribution of the data as well as the density estimation, histograms estimate the underlying variable’ probability density function. The total area of any histogram that is used for probability density is always normalized to 1. In case the length of the intervals on the x-axis are all 1, then such histogram is known to be identical to a similar, a relative frequency plot.

Any histogram can be treated as a simplistic kernel density estimation. Such estimation uses a kernel for smoothing the frequencies over the bins. Yielding a smoother probability density function, such function is known to be more accurately reflecting the distribution of the underlying variable. The density estimate can be plotted as an alternative to the histogram. It is also usually known to be drawn as a curve, not as a set of boxes.

Another alternative can be the average shifted histogram. This type of histogram is fast to compute, giving a smooth curve estimate of the density without using any kernels but it can be also created with the help of ConceptDraw DIAGRAM diagramming and drawing software by using the Histograms Solution from ConceptDraw STORE — a relatively new application developed by CS Odessa in order to provide all the ConceptDraw DIAGRAM users with so much needed and useful examples of the charts, diagrams and histograms to use them all as the drafts for the unique, great looking as well as always professionally looking drawings.

Histograms Solution

Example 1. Histogram Solution in ConceptDraw STORE

The histogram is known to be one of the seven basic tools of quality control and it can be always created, same as any other tools, with the aid of the mentioned software. Having the Histograms Solution means having eight vector objects that all can be used by any ConceptDraw DIAGRAM user as long as he or she has the previously downloaded ConceptDraw STORE application on their desktop.

Histograms can be sometimes confused with the bar charts but they are meant to be used for continuous data, where the bins represent different ranges of data when any bar chart is known to be simply a plot of categorical variables.

There are a few types of a histogram, such as an image one that acts as a graphical representation of some tonal distribution in a digital image plotting the number of pixels for each of the tonal values. Such image histograms are known to be presenting on many modern digital cameras but they can be also created on a computer in case it is needed.

The horizontal axis of each of the graphs within such image histogram is known to be representing the tonal variations. At the same time, the vertical axis represents the number of pixels in some particular tone, for example, a red one. The left side of the horizontal axis is used for representing the dark areas, including the black ones, when the middle represents only medium grey and the right-hand one – both light and pure white areas.

The vertical axis on the image histogram represents the size of the area that is being captured in each of the mentioned zones. Any image histogram created for a very dark image has the majority of its data points on both the center and the left side of the graph. Any image histogram created for a very bright image with a few dark areas or/and shadows has most of the data points in the center of the graph and on its right side.

The described image histograms can be useful tools for thresholding in the field of computer vision. And because of the information that is being contained in the graph is a representation of the pixel distribution, the image histograms can be analyzed for either valleys or peaks, or both. The mentioned threshold value can be used after for the so-called image segmentation, co-occurrence matrices and edge detection.

Another type of histograms that are widely used in the image processing as well as the photography is a color histogram. Being a representation of the distribution of colors in an image and used for digital images, any color histogram is used for representing the number of those pixels that have the colors in each of the fixed lists of the color ranges. Such ranges are expected to be spanning the image's color space and the set of all possible colors.

Histogram *

Example 2. Histogram in ConceptDraw DIAGRAM

Creating any needed histogram, such as an image or a color one, is truly simple as long as you are a ConceptDraw DIAGRAM user who has such a useful application as a ConceptDraw STORE one as downloading it you can get an access to use a Histograms solution full of already pre-designed templates of the different histograms which all can be used after as the drafts for making your own great looking drawings.


Basic Diagramming →

Perfect charts and graphics diagramming software with rich examples and template. ConceptDraw is ideal to draw Charts and Graphics.Basic Diagramming *
Picture: Basic Diagramming
Related Solution:

Business Diagram Software →

Any business process consists from a number of tasks carrying out the certain business goal. It is useful to diagram business processes to ensure that they are as foolproof, logical and sequential as possible. This business process diagram describes a typical booking process flow by the example of a cab booking process. It can be used as a roadmap for any booking system implementation. Diagramming a business process allows you to look at the entire project and take into account all types of possible scenarios. Business process diagram helps you investigate and clarify the process thoroughly so that you can find out how it can be improved. Business process diagram supports team communications by ensuring that each process element is clear and everyone in the team is on the same page. Sometimes your company brings you less profit than you expect it to be, and it’s difficult to reveal the causes. Maybe it’s time to learn new technologies, because business diagram are easily developed by means of special software, so you won’t make any extra effort. In return, you will increase your productivity and get more done in a less time.Business Diagram Software *
Picture: Business Diagram Software
Related Solutions:

Pie Chart Examples and Templates →

A pie chart or a circle graph is a circular chart divided into sectors, illustrating numerical proportion. In a pie chart, the arc length of each sector and consequently its central angle and area, is proportional to the quantity it represents. Pie chart examples and templates created using ConceptDraw DIAGRAM software helps you get closer with pie charts and find pie chart examples suite your needs.Pie Chart Examples and Templates *
Picture: Pie Chart Examples and Templates
Related Solution:

Sales Process →

ConceptDraw DIAGRAM is effective software for a variety of activity fields. Now, extended with Sales Flowcharts solution from the Marketing area of ConceptDraw Solution Park it become also useful in the field of sales. It helps to design professional looking Sales Flowcharts, Sales Process Flowcharts, Sales Process Maps, Plans and Diagrams to effectively realize the process of selling a product or service, and to display the sales results.Sales Process *
Picture: Sales Process
Related Solution: