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Correctly calculating the cost of food

Cate Burns, Gary Sacks, Mike Rayner, Gina Bilenkij, Boyd Swinburn
DOI: http://dx.doi.org/10.1111/j.1753-4887.2010.00275.x 182-183 First published online: 1 March 2010

It is important for readers to be aware that graphs shown by Drewnowski in a recent commentary in this journal1 and previous publications24 carry a serious statistical artifact. Since energy is included in the numerator on one axis (kcal/g) and in the denominator on the other axis ($/kcal), a negative auto-correlation is created. To demonstrate this artifact, we took the energy content (measured in kcal/g) and weights for 212 foods from a supermarket in Melbourne, Australia (2008 data) and applied a random number for the …

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