https://communities.sas.com/t5/Statistical-Procedures/Proc-Reliability/m-p/713897#M34503 <P>What happens when you use the extrema for the interval based on the known times?&nbsp; Does that help?&nbsp; If not, you may get a more focused answer by posting the question to the optimization, discrete-simulation and OR community, as RELIABILITY is a procedure in SAS/QC which that group is focused on.</P> <P>&nbsp;</P> <P>SteveDenham&nbsp;</P> Mon, 25 Jan 2021 14:07:54 GMT SteveDenham 2021-01-25T14:07:54Z https://communities.sas.com/t5/Statistical-Procedures/Proc-Reliability/m-p/713621#M34485 Hi,<BR />I have a problem with the RELIABILITY Procedure.<BR />I could not estimate the parameters in a recurrent events data model when exact event times are known and we have interval-censored data. When I define the left and right censoring time in the format of MODEL (variable1 variable2) I receive the following error:<BR /><BR />“You must specify the numbers of recurrences in each interval with a FREQ statement, and the number of units observed in each interval with an NENTER statement”<BR /><BR />However, these two statements are used when the event exact recurrence times are not known, but they are known exactly in my case. Sat, 23 Jan 2021 20:20:19 GMT https://communities.sas.com/t5/Statistical-Procedures/Proc-Reliability/m-p/713621#M34485 sasprogram 2021-01-23T20:20:19Z https://communities.sas.com/t5/Statistical-Procedures/Proc-Reliability/m-p/713897#M34503 <P>What happens when you use the extrema for the interval based on the known times?&nbsp; Does that help?&nbsp; If not, you may get a more focused answer by posting the question to the optimization, discrete-simulation and OR community, as RELIABILITY is a procedure in SAS/QC which that group is focused on.</P> <P>&nbsp;</P> <P>SteveDenham&nbsp;</P> Mon, 25 Jan 2021 14:07:54 GMT https://communities.sas.com/t5/Statistical-Procedures/Proc-Reliability/m-p/713897#M34503 SteveDenham 2021-01-25T14:07:54Z