Graphical Representation: Histogram (Definitions)

"A graph showing a variable's discrete values or ranges of values on the x-axis and counts or percentages on the y-axis. The number of observations for each value or range is presented as a vertical rectangle whose length is proportionate to the number of observations." (Glenn J Myatt, "Making Sense of Data: A Practical Guide to Exploratory Data Analysis and Data Mining", 2006)

"A graphical display of the frequency distribution of a set of data. Histograms display the shape, dispersion, and central tendency of the distribution of a data set." (Clyde M Creveling, "Six Sigma for Technical Processes: An Overview for R Executives, Technical Leaders, and Engineering Managers", 2006)

"A chart that shows quantities of data points that occur within various numeric ranges." (DAMA International, "The DAMA Dictionary of Data Management", 2011)

"A special form of bar chart used to describe the central tendency, dispersion, and shape of a statistical distribution." (For Dummies, "PMP Certification All-in-One For Dummies, 2nd Ed.", 2013)

[height-balanced histogram:] "A histogram in which column values are divided into buckets so that each bucket contains approximately the same number of rows." (Oracle, "Database SQL Tuning Guide Glossary", 2013)

[top frequency histogram:] "A variation of a frequency histogram that ignores nonpopular values that are statistically insignificant, thus producing a better histogram for highly popular values." (Oracle, "Database SQL Tuning Guide Glossary", 2013)

[hybrid histogram:] "An enhanced height-based histogram that stores the exact frequency of each endpoint in the sample, and ensures that a value is never stored in multiple buckets." (Oracle, "Database SQL Tuning Guide Glossary", 2013)

[frequency histogram:] "A type of histogram in which each distinct column value corresponds to a single bucket. An analogy is sorting coins: all pennies go in bucket 1, all nickels go in bucket 2, and so on." (Oracle, "Database SQL Tuning Guide Glossary", 2013)

"A chart that shows a frequency distribution." (E C Nelson & Stephen L Nelson, "Excel Data Analysis For Dummies ", 2015)

"A bar chart that shows the graphical representation of numerical data." (Project Management Institute, "A Guide to the Project Management Body of Knowledge (PMBOK Guide )", 2017)