histogram

n.
A bar graph of a frequency distribution in which the widths of the bars are proportional to the classes into which the variable has been divided and the heights of the bars are proportional to the class frequencies.

[Greek histos, mast, web + -GRAM.]

A diagram that uses rectangles to represent frequency. It differs from the bar chart in that the rectangles may have differing widths, but the key feature is that, for each rectangle, the area is proportional to the frequency represented. The term 'histogram' was introduced by Karl Pearson in his lectures prior to 1895.

Histogram. This histogram represents data on the cross-sectional area of 30 erratics (boulders left behind by retreating glaciers). Note the use of wider intervals for the classes corresponding to the scarcer larger boulders. In a histogram, area is proportional to frequency.

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A bar graph that uses the width of the bars to represent the various classes and the height of the bars to represent their relative frequencies.

Camera Histograms

Digital camera histograms show the image's overall exposure. Using 256 vertical bars to represent brightness levels from 0 to 255, the leftmost bar is the darkest pixel level (0), and the rightmost bar is the lightest (255). The height of the bars represents the total number of pixels at that brightness level.

What is of most interest to the photographer is how the bars spread horizontally from left to right. For example, if there are no bars on the left, there are no black pixels in the image.

Light Pixels

Histograms appear on the same LCD screen used to preview the image. In this daylight example, there is an absence of dark shadows because the histogram shows no pixels on the left side (dark side).

Dark Pixels

In this example, the camera was pointed into a totally dark room, and the bars are confined entirely to the leftmost side (dark side).

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1. A graphical representation, similar to a bar chart in structure, that organizes a group of data points into user-specified ranges. The histogram condenses a data series into an easily interpreted visual by taking many data points and grouping them into logical ranges or bins.



2. The MACD histogram is a very common technical indicator that illustrates the difference between the MACD line and the trigger line. This difference is then plotted on a chart in the form of a histogram to make it easy for a trader to determine a specific asset's momentum.

Investopedia Says:
1. Histograms are commonly used in statistics to demonstrate how many of a certain type of variable occurs within a specific range. For example, a census focused on the demography of a country may use a histogram of how many people there are between the ages of 0 and 10, 11 and 20, 21 and 30, 31 and 40, 41 and 50 etc. This histogram would look similar to the graph above.

2. MACD histograms are a popular tool used in technical analysis to gauge the strength of an asset's momentum. An increasing MACD histogram signals an increase in upward momentum while a decreasing histogram is used to signal downward momentum.

Related Links:
This method, which works particularly well for currency traders, helps avoid stop-order triggers before the real reversal. Trading The MACD Divergence
The use of the simple MACD histogram could change how you trade currency pairs for good. Keep An Eye On Momentum
This straightforward histogram can help you analyze the buying and selling interest in a stock. Gauging Support And Resistance With Price By Volume
Read the case against this well-established indicator. Candle Sheds More Light Than The MACD

A bar graph in which the frequency of occurrence for each class of data is represented by the relative height of the bars.

n

A bar graph; a graphic representation of a frequency distribution.

A graph which uses bars (rectangles) to show the frequency of certain classes of values within a dataset. Classes can be descriptive, as in a histogram showing numbers of voters for different parties, or numerical, so that the numbers, or percentages of a population in different age groups (0-4, 5-9, 10-14, and so on) are illustrated by a rectangle (bar). The widths of the rectangles should be proportional to the class intervals just as the heights are proportional to the frequencies of occurrence (numbers, or percentages) within each class.

In digital photography, an electronic bar chart showing the distribution of tones in an image, from completely dark (on the left) to completely light (on the right). In advanced cameras it can be displayed ‘live’ as an exposure aid in the viewfinder, to indicate the dynamic (tonal) range of the image being taken.

— Robin Lenman

A graph used in statistics in which frequency distributions of interval-level data are represented by contiguous rectangles. In a histogram, the area of each rectangle is directly proportional to the frequency of each class interval represented. Compare bar chart.

A graph in which values found in a statistical study are represented by lines or symbols placed horizontally or vertically, to indicate frequency distribution.

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Dansk (Danish)
n. - histogram, blokdiagram

Nederlands (Dutch)
histogram

Français (French)
n. - histogramme

Deutsch (German)
n. - Histogramm, Balkendiagramm

Ελληνική (Greek)
n. - (στατιστικό) ιστόγραμμα

Italiano (Italian)
istogramma

Português (Portuguese)
n. - histograma (m)

Русский (Russian)
гистограмма

Español (Spanish)
n. - histograma

Svenska (Swedish)
n. - histogram, stapeldiagram

中文（简体）(Chinese (Simplified))
柱状图

中文（繁體）(Chinese (Traditional))
n. - 柱狀圖

한국어 (Korean)
n. - 막대 그래프

日本語 (Japanese)
n. - 柱状図表, 柱状グラフ

العربيه (Arabic)
‏(الاسم) الرسم البياني النسيجي, رسم بياني مؤلف من سلسله من المستطيلات في علم الاحصاء‏

עברית (Hebrew)
n. - ‮תרשים עמודות, היסטוגרמה‬

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