Standard Deviation Classification

Discussion created by BrianJBaldwin on Dec 5, 2012
Quick question about the option for doing class breaks as Standard Deviations.  When I select this option, and then select 'show SD's', the breaks do not fall on the standard deviations shown.  I understand that the displayed SD's move according to how much you zoom in on selected data, but why when displaying the whole data set do the breaks not line up this way?  Could someone help explain the process that is going on?