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E Sankey Licence Key The E Sankey is a triangular bar chart that is used to illustrate proportional relationships between two (or more) sets of quantitative variables. It was invented by George W.S. Sankey in 1901 and he later applied for a patent in 1902 which was granted in 1904, with priority claimed from work Copyrighted Ellis Elisha Sankey 1891-1902 The following year the US Congress passed the Copyright Act for this invention; however it did not mention any priority date or even who owned the copyright. Since 2006, when All Rights Reserved were introduced as part of U. S. copyright law, the E Sankey is technically still under copyright, and therefore cannot be reproduced in any form without permission from the patent holders. Because of its appearance and simplicity, it is popular with some statisticians and sociologists (particularly in the field of education) for displaying two-variable relationships graphically. However, it is rarely used by dentists. The E Sankey chart consists of a trapezoidal bar on which are marked scales representing each of the two variables to be compared. The height of each bar is determined by multiplying the values given to either variable by a common multiplier (the ratio between them) or by dividing one value by another (the inverse). This multiplier/inverse value is commonly referred to as the "correlation". The bar lengths are measured on a scale running from left to right on the chart, with the (positive) numbers placed on the left and negative numbers placed on the right. The scales may be incised, written or printed in any way, though an "arrow" symbol usually serves as a convenient convention. Each bar is divided into different sections according to its objective function (number of numbered data points from 1 to "n"), with each section representing a different value for a given variable. These sections are often called incisors. The chart is usually oriented with the variable whose values are greater on the right and lesser on the left. The term "sankey" and variations, such as "sankey diagram", "sankey flow diagram", and "sankey chart", are also sometimes used for similar diagrams or charts that represent flows of material or money over time. The word is sometimes used to refer to only the rectangular portion of a Sankey diagram, which represents cumulative amounts rather than per-unit amounts. Such diagrams are used to model the flow of anything that can be "counted" over time. For instance, they are often used to represent revenues, expenditures, or stocks of anything that is produced at a constant rate. Sankey diagrams are also sometimes used without the rectangular diagram portion to show pathways through a system, for example for power distribution grids. The width of the line is proportional to the capacity of the link and its colour represents whether it transports power into or out of that section of the grid.Sankey's original patent describes some equipment that was used to produce these charts on rolls of paper on an easel similar to a blackboard. cfa1e77820
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