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# Design elements - Histograms

The vector stencils library "Histograms" contains 10 chart templates. Use it to design your histograms for visualizing frequency distribution data in ConceptDraw PRO diagramming and vector drawing software. "In statistics, a histogram is a graphical representation of the distribution of data. It is an estimate of the probability distribution of a continuous variable... A histogram is a representation of tabulated frequencies, shown as adjacent rectangles, erected over discrete intervals (bins), with an area equal to the frequency of the observations in the interval. The height of a rectangle is also equal to the frequency density of the interval, i.e., the frequency divided by the width of the interval. The total area of the histogram is equal to the number of data. A histogram may also be normalized displaying relative frequencies. It then shows the proportion of cases that fall into each of several categories, with the total area equaling 1. The categories are usually specified as consecutive, non-overlapping intervals of a variable. The categories (intervals) must be adjacent, and often are chosen to be of the same size. The rectangles of a histogram are drawn so that they touch each other to indicate that the original variable is continuous. Histograms are used to plot the density of data, and often for density estimation: estimating the probability density function of the underlying variable. The total area of a histogram used for probability density is always normalized to 1." [Histogram. Wikipedia] The chart templates example "Design elements - Histograms" is included in the Basic Histograms solution from the Graphs and Charts area of ConceptDraw Solution Park.