Abstract
THERE are two types of semi-logarithmic grids : one, called arith-log grid (a system of rectangular co-ordinates, in which the axis of abscissæ is divided arithmetically and that of ordinates logarithmically), is frequently used for graphical representations because, on such a grid, the relative increase or decrease of the intensity of a phenomenon is shown immediately by the slope of the curve obtained by plotting its value at different times; the other, which may be termed ‘log-arith’ grid (a system of rectangular co-ordinates in which the axis of abscissæ is divided logarithmically and that of the ordinates arithmetically), is used rarely; although this type of grid has some very useful peculiarities. It has been recognized that many moderately skew frequency distributions arising from empirical data1 or fulfilling certain theoretical conditions2 are reduced to normal curves of errors when plotted on a log-arith grid. Whereas the log-arith grid shares this peculiarity with other grids where the abscissa is scaled according to different functions3, another feature, peculiar to the log-arith grid and corresponding to the well-known peculiarity of the arith-log grid, seems to have never been appreciated.
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References
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MUHSAM, H. Representation of Relative Variability on a Semi-logarithmic Grid. Nature 158, 453 (1946). https://doi.org/10.1038/158453b0
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DOI: https://doi.org/10.1038/158453b0
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