[Chimera-users] estimaded standard deviation (sigma levels) for electron densities in volume viewer
goddard at cgl.ucsf.edu
Mon Nov 28 13:27:26 PST 2005
Chimera currently has no capability to display standard deviation
values for volume data. It would be useful if the volume viewer dialog
had an option to use sigma units.
Could you tell me what crystallographers define "1 sigma" to be for
a density map? Is it the root mean square density value over the entire
For now here is a Chimera tool to report mean, root mean square, and
standard deviation values for a volume data set.
This archive contains a directory VolumeStatistics that you put in
your Chimera distribution in
or on the Mac in
Then when you start Chimera you will have a new menu entry
Tools -> Volume Data -> Volume Statistics
that reports the values for the current volume viewer data set, printing
them in the Chimera reply log (menu entry Favorites / Reply Log).
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