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The statistical precision of a chord method for estimating fractal dimensionfrom a correlation integral is derived. The optimal chord length is determined,and a comparison is made to other estimators. These calculations use theapproximation that all pairwise distances between the points are statisticallyindependent; the adequacy of this approximation is assessed numerically. Thechord method provides a very quick and easy dimension estimate which is onlyslightly less precise than the optimal estimator. Keywords: correlationdimension, statistical error

STATISTICAL ERROR IN A CHORD ESTIMATOR OF CORRELATION DIMENSION: THE “RULE OF FIVE”