Estimation of uncertainties in XAFS data

The estimate of measurement uncertainties in XAFS spectra is one of the mos t important and difficult aspects of error analysis for XAFS data. Since se veral different analysis methods are used to determine structural parameter s and their uncertainties from XAFS data, and no universally agreed-upon st andard exists, the ability to compare estimates of uncertainties from diffe rent methods is vital. We discuss numerical aspects of the propagation of m easurement uncertainties from raw absorption coefficient to analyzed signal in k- and R-space. We focus our attention on the conversion of measurement uncertainties between k- and R-space representations of XAFS data, and on the testing of this conversion procedure for data dominated by random fluct uations.