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STATISTICS. For the article “A note on Kalman Filter” by C. R. Rao, which appeared in number 19, September 11, 2001, of Proc. Natl. Acad. Sci. USA (98, 10557–10559), due to a printer's error, a minus was omitted in the minimum error dispersion matrix for Eq. 3.5. The correct matrix is printed below.
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