Abstract
IN the recent article by Prof. Robert B. Grieves and Dibakar Bhattacharyya1, Fig. 2 shows a relation between two variables with the statement “… The residual DSS concentrations are related in Fig. 2 to the ratio of DSS to trivalent iron in the feed. As xi/zi was increased, xr remained relatively constant and then rose sharply above a feed ratio of approximately 1.0.”. In view of the close attention given to statistical aspects of data analysis in other parts of the article, the statement about the data of Fig. 2 appeared somewhat questionable. Accordingly, I read off the numbers from the graph as best I could with a piece of superimposed graph paper and replotted the data on log–log co-ordinates. The data suggested a relation of the form xr=√(2xi/zi), so I prepared a graph as shown in Fig. 1. Within the variability of the data, it does not appear to me that the data can be considered approximately constant below xi/zi of 1, but rather that a regular increase is observed over the full range of the values. Certainly the variability of the data does not warrant a definite conclusion on the relationship.
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Grieves, R. B., and Bhattacharyya, D., Nature, 207, 476 (1965).
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WIEGAND, J. Presenting the Results. Nature 210, 974 (1966). https://doi.org/10.1038/210974a0
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DOI: https://doi.org/10.1038/210974a0
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