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Dear Eleanor:
I don't have the data set in front of me, but if the lack of closure were,
say, 0.5, and the measured centric differences were slightly different
(say by 3 %), presumably the denominator would be very small, and then
the fraction would become larger than 1. The closer the measured
difference gets to the real difference (0), the larger the fraction then
becomes.
I'm assuming at least one centric reflection is mis-phased, so the lack
of closure error could then be other than 0 for centrics.
Many thanks.
Bill
On Fri, 19 May 2006, Eleanor Dodson wrote:
I cant see how you can have an anomalous Cullis R > 0 for centrics. It is
Lack_of_closure/ Observed_Difference.
Maybe when the data was processed you have a residual Anom_diff which should
be 0 but has been kept as a measure of error or something? If so I guess it
could be 1?
Eleanor
William Scott wrote:
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Hi everyone:
How is an anomalous Cullis R defined for centric reflections? (If it is
the F+ - F-, how can that be meaningful?)
Thanks.
Bill Scott
