topic Need help with a clustering problem in SAS Procedures https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138767#M37223 <HTML><HEAD></HEAD><BODY><P>I'd like to run a regression where the dependent variable (say, stocks' abnormal returns) are related to a few explanatory variables.&nbsp; The problem is that all the stocks come from the same industry,and so the error terms are probably correlated.&nbsp; Is there a SAS function that can take care of this problem?&nbsp; Pleade note that the data are NOT time-series data.&nbsp; The abnormal returns are measured at one single point in time.&nbsp; In other words, the data are just cross-sectional data.&nbsp; Thanks.</P></BODY></HTML> Sun, 12 Jan 2014 23:09:20 GMT Everton 2014-01-12T23:09:20Z Need help with a clustering problem https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138767#M37223 <HTML><HEAD></HEAD><BODY><P>I'd like to run a regression where the dependent variable (say, stocks' abnormal returns) are related to a few explanatory variables.&nbsp; The problem is that all the stocks come from the same industry,and so the error terms are probably correlated.&nbsp; Is there a SAS function that can take care of this problem?&nbsp; Pleade note that the data are NOT time-series data.&nbsp; The abnormal returns are measured at one single point in time.&nbsp; In other words, the data are just cross-sectional data.&nbsp; Thanks.</P></BODY></HTML> Sun, 12 Jan 2014 23:09:20 GMT https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138767#M37223 Everton 2014-01-12T23:09:20Z Re: Need help with a clustering problem https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138768#M37224 <HTML><HEAD></HEAD><BODY><P class="vurls">Your best bet is likely to either use GEE (Generalized Estimating Equations) in Proc Genmod <A href="http://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_genmod_sect008.htm" title="http://support.sas.com/documentation/cdl/en/statug/63347/HTML/default/viewer.htm#statug_genmod_sect008.htm">SAS/STAT(R) 9.22 User's Guide</A> or here are another couple of ways to use clusters in SAS <A href="http://nesug.org/proceedings/nesug06/an/da01.pdf" title="http://nesug.org/proceedings/nesug06/an/da01.pdf">http://nesug.org/proceedings/nesug06/an/da01.pdf</A> Hope this helps.</P></BODY></HTML> Mon, 13 Jan 2014 00:29:49 GMT https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138768#M37224 overmar 2014-01-13T00:29:49Z Re: Need help with a clustering problem https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138769#M37225 <HTML><HEAD></HEAD><BODY><P>Thanks, overmar.&nbsp; I've tried to learn how to use Proc Genmod and also Proc Surveyreg.&nbsp; But I don't think they can be used in my case.&nbsp; My sample all comes from the same industry, and so there is only class of observations (i.e., no multiple clusters).&nbsp; I just want to run a regression on this sample.&nbsp; Since the error terms may be correlated, I'd like to know if there a SAS function that can adjust the standard errors of the coefficients to account for the correlation.&nbsp; Thanks.</P></BODY></HTML> Sun, 19 Jan 2014 01:42:23 GMT https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138769#M37225 Everton 2014-01-19T01:42:23Z Re: Need help with a clustering problem https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138770#M37226 <HTML><HEAD></HEAD><BODY><P>You're looking for a way to adjust for dependent data. </P><P></P><P>I don't believe there's an easy way. One is to cluster the data, if you know what the clusters are, but since you have only one cluster I'm not sure. More likely it seems like its simply a limitation of your analysis rather than something you can control for in any way.&nbsp; </P></BODY></HTML> Sun, 19 Jan 2014 03:27:36 GMT https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138770#M37226 Reeza 2014-01-19T03:27:36Z Re: Need help with a clustering problem https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138771#M37227 <HTML><HEAD></HEAD><BODY><P>Thanks, Reeza.&nbsp; Sorry I didn't thank you earlier.&nbsp; I got a flu that knocked me out during the past two weeks.</P></BODY></HTML> Sat, 08 Feb 2014 17:07:39 GMT https://communities.sas.com/t5/SAS-Procedures/Need-help-with-a-clustering-problem/m-p/138771#M37227 Everton 2014-02-08T17:07:39Z