topic recalculating parameters of the standard deviational ellipse in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222073#M698 <HTML><HEAD></HEAD><BODY><SPAN>Hi colleagues,</SPAN><BR /><SPAN>I am working with ArcGIS 10.0 (SP 4) and are trying very hard to recalculate the XStdDist and YStdDist values for the Standard Deviational Ellipse ArcGIS offers me by hand (using Excel).</SPAN><BR /><SPAN>I was able to reproduce the angle of rotation but not more. The values I get for the axes of the ellipse do not differ from each other and are completely different from the ArcGIS results.</SPAN><BR /><SPAN>I used the formulars in the ArcGIS Help but somewhere I am doing a fatal mistake.</SPAN><BR /><SPAN>Could anybody help me with a hint? I am desperately looking for a solution. </SPAN><BR /><SPAN>Thanks so much in advance</SPAN><BR /><SPAN>Susanne</SPAN></BODY></HTML> Fri, 20 Apr 2012 15:07:58 GMT SusanneZimmermann-Janschitz 2012-04-20T15:07:58Z recalculating parameters of the standard deviational ellipse https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222073#M698 <HTML><HEAD></HEAD><BODY><SPAN>Hi colleagues,</SPAN><BR /><SPAN>I am working with ArcGIS 10.0 (SP 4) and are trying very hard to recalculate the XStdDist and YStdDist values for the Standard Deviational Ellipse ArcGIS offers me by hand (using Excel).</SPAN><BR /><SPAN>I was able to reproduce the angle of rotation but not more. The values I get for the axes of the ellipse do not differ from each other and are completely different from the ArcGIS results.</SPAN><BR /><SPAN>I used the formulars in the ArcGIS Help but somewhere I am doing a fatal mistake.</SPAN><BR /><SPAN>Could anybody help me with a hint? I am desperately looking for a solution. </SPAN><BR /><SPAN>Thanks so much in advance</SPAN><BR /><SPAN>Susanne</SPAN></BODY></HTML> Fri, 20 Apr 2012 15:07:58 GMT https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222073#M698 SusanneZimmermann-Janschitz 2012-04-20T15:07:58Z Re: recalculating parameters of the standard deviational ellipse https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222074#M699 <HTML><HEAD></HEAD><BODY><SPAN>and what are the result summaries between the two?</SPAN></BODY></HTML> Fri, 20 Apr 2012 16:19:18 GMT https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222074#M699 DanPatterson_Retired 2012-04-20T16:19:18Z Re: recalculating parameters of the standard deviational ellipse https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222075#M700 <HTML><HEAD></HEAD><BODY><SPAN>Thanks for your reply. The sum is simply about the doubled value since they are almost the same.</SPAN><BR /><SPAN>I have attached the excel sheet to my mail because its hard to explain in words.</SPAN><BR /><SPAN>I am sure I made a simple but essentail mistake and although trying to solve I am some kind of "blind".</SPAN><BR /><SPAN>Thanks</SPAN><BR /><SPAN>Susanne</SPAN></BODY></HTML> Wed, 25 Apr 2012 07:29:41 GMT https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222075#M700 SusanneZimmermann-Janschitz 2012-04-25T07:29:41Z Re: recalculating parameters of the standard deviational ellipse https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222076#M701 <HTML><HEAD></HEAD><BODY><SPAN>Dear colleagues,</SPAN><BR /><SPAN>I did find the mistake - the formulas contain a mistake - instead of a minus there seems to be a plus in the formula for the standard dev of the y-axis. Additional there is a scaling factor implemented.</SPAN><BR /><SPAN>Thanks</SPAN><BR /><SPAN>Susanne</SPAN></BODY></HTML> Thu, 26 Apr 2012 08:59:14 GMT https://community.esri.com/t5/spatial-statistics-questions/recalculating-parameters-of-the-standard/m-p/222076#M701 SusanneZimmermann-Janschitz 2012-04-26T08:59:14Z