https://communities.sas.com/t5/SAS-Procedures/Ranuni-seeds-and-the-proc-reg-procedure/m-p/16906#M3165 I am confused with one problem that might due to ranuni function or the proc reg procedure. Here is the situation:<BR /> 1. I created several dummy variables and try to create a new data with contains only the dummy variables and their source raw variables. Since the file is big, I split the file into two parts as my testing data and validation data. Here I use the ranuni to split.<BR /> 2. In one of my procedure, I use proc reg and sas return a message indicating that my liner model is not fully ranked due to 'since the variables are a linear combination of other variables as shown'.<BR /> <BR /> Since I am pretty sure that this dummy variable could not be the linear combination of others, so I went back and check my codes. Well, nothing went wrong. However, after I changed the seed of the ranuni, that warning message just disappeared and my codes worked fine. <BR /> <BR /> Could anyone tell me why this happen? Does it relate to the mechansim that ranuni works in SAS?<BR /> <BR /> <BR /> Thank you very much for any comments! Fri, 09 May 2008 19:03:20 GMT deleted_user 2008-05-09T19:03:20Z https://communities.sas.com/t5/SAS-Procedures/Ranuni-seeds-and-the-proc-reg-procedure/m-p/16906#M3165 I am confused with one problem that might due to ranuni function or the proc reg procedure. Here is the situation:<BR /> 1. I created several dummy variables and try to create a new data with contains only the dummy variables and their source raw variables. Since the file is big, I split the file into two parts as my testing data and validation data. Here I use the ranuni to split.<BR /> 2. In one of my procedure, I use proc reg and sas return a message indicating that my liner model is not fully ranked due to 'since the variables are a linear combination of other variables as shown'.<BR /> <BR /> Since I am pretty sure that this dummy variable could not be the linear combination of others, so I went back and check my codes. Well, nothing went wrong. However, after I changed the seed of the ranuni, that warning message just disappeared and my codes worked fine. <BR /> <BR /> Could anyone tell me why this happen? Does it relate to the mechansim that ranuni works in SAS?<BR /> <BR /> <BR /> Thank you very much for any comments! Fri, 09 May 2008 19:03:20 GMT https://communities.sas.com/t5/SAS-Procedures/Ranuni-seeds-and-the-proc-reg-procedure/m-p/16906#M3165 deleted_user 2008-05-09T19:03:20Z https://communities.sas.com/t5/SAS-Procedures/Ranuni-seeds-and-the-proc-reg-procedure/m-p/16907#M3166 creating dummy variables without any restriction can endup with linear dependency (once in thousands). its name is ranuni (<I><B>random</B></I>). better use a big seed number. Fri, 20 Jun 2008 17:05:22 GMT https://communities.sas.com/t5/SAS-Procedures/Ranuni-seeds-and-the-proc-reg-procedure/m-p/16907#M3166 deleted_user 2008-06-20T17:05:22Z