https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62867#M2968 Regression of that size. No problem. The linear regression procedures (REG, GLM, etc), use memory based on the number of variables and generally make one pass through the data for each execution of the procedure.<BR /> <BR /> Other regression type procedures (LOGISTIC, PHREG) use search algorithms that do run through the data multiple times and potentially take days to run.<BR /> <BR /> The reference manual has some information on the execution algorithms in the "details" section of each chapter.<BR /> <BR /> Doc Muhlbaier<BR /> Duke Fri, 06 May 2011 12:27:04 GMT Doc_Duke 2011-05-06T12:27:04Z https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62866#M2967 My company has a very dataset which requires to do a regession analysis. The dataset has over 2million observations for the customers, and 100 variables (many are categorical).<BR /> <BR /> I want to use SAS to run a regression model. But just worry about the massive size of the dataset. Will this cause computer crash if running for days or weeks?<BR /> <BR /> An suggestions? Fri, 06 May 2011 11:05:08 GMT https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62866#M2967 bncoxuk 2011-05-06T11:05:08Z https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62867#M2968 Regression of that size. No problem. The linear regression procedures (REG, GLM, etc), use memory based on the number of variables and generally make one pass through the data for each execution of the procedure.<BR /> <BR /> Other regression type procedures (LOGISTIC, PHREG) use search algorithms that do run through the data multiple times and potentially take days to run.<BR /> <BR /> The reference manual has some information on the execution algorithms in the "details" section of each chapter.<BR /> <BR /> Doc Muhlbaier<BR /> Duke Fri, 06 May 2011 12:27:04 GMT https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62867#M2968 Doc_Duke 2011-05-06T12:27:04Z https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62868#M2969 Many thanks indeed, Duke. Fri, 06 May 2011 15:32:11 GMT https://communities.sas.com/t5/Statistical-Procedures/A-huge-dataset-with-100-variables-and-2-million-observations/m-p/62868#M2969 bncoxuk 2011-05-06T15:32:11Z