https://communities.sas.com/t5/SAS-Procedures/phreg/m-p/26746#M6137 I am using the phreg procedure to analyze some data, and the output shows that the number of obeservations used is less than the number of observations read. For some reason it is not using some of the observations. Any ideas why it might be doing this? Thu, 19 Jun 2008 18:55:33 GMT deleted_user 2008-06-19T18:55:33Z https://communities.sas.com/t5/SAS-Procedures/phreg/m-p/26746#M6137 I am using the phreg procedure to analyze some data, and the output shows that the number of obeservations used is less than the number of observations read. For some reason it is not using some of the observations. Any ideas why it might be doing this? Thu, 19 Jun 2008 18:55:33 GMT https://communities.sas.com/t5/SAS-Procedures/phreg/m-p/26746#M6137 deleted_user 2008-06-19T18:55:33Z