Revision as of 19:38, 7 November 2009

Methods of graphic representation¹ or diagrammatic representation¹ may be used to illustrate an argument. Here the data are represented in a diagram², graph², figure² (cf. 131-3), chart³ or map³. In France the word schema is used to denote a diagram which gives a schematic⁴ representation of a problem. Where in a diagram one co-ordinate axis is graduated logarithmically and the other arithmetically, the graph is called a semi-logarithmic graph⁵, though such graphs are often inaccurately referred to as logarithmic graphs⁵. A true logarithmic graph⁶ has both axes graduated logarithmically and is sometimes referred to as a double logarithmic graph⁶. Frequency distribution may be represented graphically by frequency polygons⁷, obtained by joining points representing class frequencies by straight lines, or by histograms⁸, where a class frequency is represented by the area of a rectangle with the class interval as its base, or by bar charts⁹, in which the class frequencies are proportionate to the length of a bar.
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