topic What values of delta-beta and cook's distance be considered influential in logistic regression? in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259217#M13701 <P>How to detect influential observations in logistic regressiobn?</P> Sat, 26 Mar 2016 12:36:32 GMT partha1 2016-03-26T12:36:32Z What values of delta-beta and cook's distance be considered influential in logistic regression? https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259217#M13701 <P>How to detect influential observations in logistic regressiobn?</P> Sat, 26 Mar 2016 12:36:32 GMT https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259217#M13701 partha1 2016-03-26T12:36:32Z Re: What values of delta-beta and cook's distance be considered influential in logistic regression? https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259236#M13702 <P>The <A href="http://support.sas.com/documentation/cdl/en/statug/63962/HTML/default/viewer.htm#statug_logistic_sect049.htm" target="_self">documentation for the influence diagnostics</A> says "the distributions of these diagnostic statistics are not known, so cutoff values cannot be given for determining when the values are large."&nbsp;To use these statistics, you plot them against an index and look for outliers.</P> Sat, 26 Mar 2016 22:25:37 GMT https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259236#M13702 Rick_SAS 2016-03-26T22:25:37Z Re: What values of delta-beta and cook's distance be considered influential in logistic regression? https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259241#M13703 <PRE> Check MODEL statement option OBSTATS in PROC GENMOD . </PRE> Sun, 27 Mar 2016 03:14:43 GMT https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259241#M13703 Ksharp 2016-03-27T03:14:43Z Re: What values of delta-beta and cook's distance be considered influential in logistic regression? https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259247#M13704 Should i plot cook's D against predicted probabilities?<BR />How to decide which one is outlier in absence of any cutoff value? Sun, 27 Mar 2016 06:43:51 GMT https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259247#M13704 partha1 2016-03-27T06:43:51Z Re: What values of delta-beta and cook's distance be considered influential in logistic regression? https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259270#M13705 <P>What is an outlier? The answer depends on you, the analyst. An influential observation can be an important observation to explain what's going on in your data or it might be an aberrant case where something went wrong. Influence diagnostics tell you which cases are worth investigating, nothing more.</P> <P><BR />If some cases are much more influential than the rest, then go to the source and seek answers about those.</P> Sun, 27 Mar 2016 19:16:57 GMT https://communities.sas.com/t5/Statistical-Procedures/What-values-of-delta-beta-and-cook-s-distance-be-considered/m-p/259270#M13705 PGStats 2016-03-27T19:16:57Z