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[ddlm-group] Improving the enumeration_range definition.

  • To: ddlm-group <ddlm-group@iucr.org>
  • Subject: [ddlm-group] Improving the enumeration_range definition.
  • From: James Hester <jamesrhester@gmail.com>
  • Date: Tue, 26 Mar 2019 17:11:08 +1100
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Dear DDLm group

A suggestion has been put forward (see https://github.com/COMCIFS/cif_core/issues/116) to clarify the meaning of enumeration ranges in the presence of SU. So instead of a hard boundary, a value may lie with +- 3su of the upper/lower boundary where it has been specified. The suggestion is to expand the _enumeration_range text as follows:

(Old text)

      The inclusive range of values "from:to" allowed for the defined item.

(New text)

      The inclusive range of values "from:to" allowed for the defined item. If items have associated SU, the value must lie in the 99.97% Gaussian confidence interval 
(lower_limit -3u) =< x =< (upper_limit + 3u). 

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