topic Re: ArcGIS standard deviation classification in ArcGIS Pro Questions

ArcGIS standard deviation classification

XiaojinWang — Wed, 17 Oct 2018 17:19:04 GMT

I want to use standard deviation classification method for my map in ArcGIS, but the default class are -0.5 st dev - +0.5 st dev; 0.5 st dev-1.5 st dev; etc. I wonder if there's a way to use 0-1 st dev, 1-2 st dev, etc. Thanks.

Re: ArcGIS standard deviation classification

DanPatterson_Retired — Wed, 17 Oct 2018 17:52:08 GMT

yes

Then modify your breaks from there once you get the range values, should you want to consolidate those below the mean

Re: ArcGIS standard deviation classification

XiaojinWang — Wed, 17 Oct 2018 17:58:36 GMT

Hi Dan,

Thanks for the answer. I know how to choose the interval size. My question was how to set the cut off values to be from 0-1 st dev instead of -0.5-0.5 st dev, see the resulted default classes from standard deviation classification method on Classifying numerical fields for graduated symbology—Help | ArcGIS for Desktop . I know i could calculate the mean first and set the limits manually. I wonder if there's an option in ArcGIS to do it more easily. Thanks.

Re: ArcGIS standard deviation classification

DanPatterson_Retired — Wed, 17 Oct 2018 18:07:18 GMT

Don't see one, I switch to manual after (jot down the breaks, just in case, most people don't want to calculate the mean or std dev first)

Re: ArcGIS standard deviation classification

DanPatterson_Retired — Wed, 17 Oct 2018 18:13:31 GMT

like so... took about 30 seconds to move the slider to the mean, then right-click and remove the negative breaks