topic Re: Why do we get different COtypes or outliers on repeating the &quot;Optimized Outlier analysis&quot; and &quot;Cluster and Outlier analysis&quot; in Spatial Statistics Questions https://community.esri.com/t5/spatial-statistics-questions/why-do-we-get-different-cotypes-or-outliers-on/m-p/567982#M1821 <HTML><HEAD></HEAD><BODY><P>Hello!</P><P></P><P>Different results can happen for a couple different reasons.&nbsp;</P><P>- Parallel processing can affect precision of the analysis which can create slightly different results from run to run.</P><P>- Permutations&nbsp;will also create slightly different results.&nbsp; You can fix this in one of 2 ways.&nbsp; You can set the permutations parameter to 0 or you can use the Random Number Generator Environment.&nbsp; If you set the random seed to anything other than 0 (let's say 2 and then use the seed 2 every time), you should receive the same results every run.</P><P></P><P></P><P>Hope this was helpful.&nbsp; Let me know if you have any other questions.</P><P>-Jenora</P></BODY></HTML> Wed, 29 Jan 2020 22:05:56 GMT JenoraD_Acosta 2020-01-29T22:05:56Z Why do we get different COtypes or outliers on repeating the "Optimized Outlier analysis" and "Cluster and Outlier analysis" https://community.esri.com/t5/spatial-statistics-questions/why-do-we-get-different-cotypes-or-outliers-on/m-p/567981#M1820 <HTML><HEAD></HEAD><BODY><P style="margin: 0in; margin-bottom: .0001pt;"><SPAN style="font-size: 11.5pt; font-family: 'Helvetica',sans-serif; color: #3d3d3d;">Hi all,</SPAN></P><P style="margin: 0in; margin-bottom: .0001pt;"><SPAN style="font-size: 11.5pt; font-family: 'Helvetica',sans-serif; color: #3d3d3d;">I am new to ArcGIS and am looking&nbsp;to find&nbsp;outliers (high and low) in my data. The variable I am using is a disease severity variable ranging from 0 to 60 (i.e.&nbsp;my analysis field). I am trying to find outliers in this variable. However, I recently figured that each time I run the Optimized outlier analysis or the cluster and outlier analysis, there&nbsp;is a good proportion of observations with&nbsp;changed&nbsp;COtypes/p-values, or that I am finding different outlier observations on each run. Although I see that a good proportion are the same when repeated, I am concerned&nbsp;with this change and don't understand why this is happening.&nbsp;I would really appreciate it if&nbsp;anyone could explain why this happens with outlier analysis (Local Moran’s I?) and can I trust that the outliers produced, although different in each run are actually outliers that I can use for my study? Thank you very much for your kind responses.</SPAN></P></BODY></HTML> Tue, 24 Dec 2019 23:03:50 GMT https://community.esri.com/t5/spatial-statistics-questions/why-do-we-get-different-cotypes-or-outliers-on/m-p/567981#M1820 PoojanShrestha 2019-12-24T23:03:50Z Re: Why do we get different COtypes or outliers on repeating the "Optimized Outlier analysis" and "Cluster and Outlier analysis" https://community.esri.com/t5/spatial-statistics-questions/why-do-we-get-different-cotypes-or-outliers-on/m-p/567982#M1821 <HTML><HEAD></HEAD><BODY><P>Hello!</P><P></P><P>Different results can happen for a couple different reasons.&nbsp;</P><P>- Parallel processing can affect precision of the analysis which can create slightly different results from run to run.</P><P>- Permutations&nbsp;will also create slightly different results.&nbsp; You can fix this in one of 2 ways.&nbsp; You can set the permutations parameter to 0 or you can use the Random Number Generator Environment.&nbsp; If you set the random seed to anything other than 0 (let's say 2 and then use the seed 2 every time), you should receive the same results every run.</P><P></P><P></P><P>Hope this was helpful.&nbsp; Let me know if you have any other questions.</P><P>-Jenora</P></BODY></HTML> Wed, 29 Jan 2020 22:05:56 GMT https://community.esri.com/t5/spatial-statistics-questions/why-do-we-get-different-cotypes-or-outliers-on/m-p/567982#M1821 JenoraD_Acosta 2020-01-29T22:05:56Z