@MISC-Bl_statisticalmethods, author – “J. Martin Bl and Douglas G. Altman,” title – “STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT” year – “” The clinical comparison of a new measurement technique with an established technique is often necessary to see if they are sufficiently agreeable for the new one to replace the old one. Such studies are often subject to inappropriate analysis, including using correlation coefficients. The use of correlation is misleading. An alternative approach, based on graphic techniques and simple calculations, is described with the link between this analysis and the evaluation of repeatability. (Lancet, 1986; i: 307-310) Correlation coefficient new method of measuring simple method of calculating clinical graphical technical comparison.

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