Hi, In order to do some data preparation, I need to run a program like the following, where I can use a SQL SELECT statement within a data step. I am not sure whether this is something doable is SAS or I need to use a higher-level language (e.g., Java) for that. I appreciate if you could help me out. //update: I want to assign different values to each hospital visit of a patient based on the time it has passed between their last discharge and the current visit. If they visit much earlier than the hitherto data set average, they will get a larger number showing they are riskier. I have attached a sample data with desired output. Thanks for your great support! data in; set out; by patient_sk; if first.patient_sk then prob = (select avg(readmission_time) from out where discharged_dt_tm <= date1); // date1 is the value of the date_var in the current record else prob = (admitted_dt_tm - lag(discharged_dt_tm)) / (select avg(readmission_time) from out where discharged_dt_tm <= date1); run;
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