sas interview questions oncology adtte adsl adrs

Other time units, such as months that we commonly see in oncology analyses, can be requested by specifying the out_unit parameter. Creating and Using New Anti-Cancer Start Date for deriving NACTDT).Īdtte % derive_vars_duration( new_var = AVAL, start_date = STARTDT, end_date = ADT ) STUDYID The date can be provided as date ( -DT variable), datetime ( -DTM variable), or character ISO-8601 date ( -DTC variable).ĬDISC strongly recommends CNSR = 0 for events and positive integers for censorings.

which variable provides the date ( date parameter).

the value of the CNSR variable ( censor parameter), and.

which observations ( filter parameter) of a source dataset ( dataset_name parameter) are potential events or censorings,.

The events and censorings are defined by the admiral::event_source() and the admiral::censor_source() class respectively. If no event occurred, the analysis date is set to the latest censoring date. In the affirmative the analysis date ADT is set to the earliest event date. Usually it is called several times.įor each subject it is determined if an event occurred.

It adds one parameter to the input dataset with one observation per subject. To derive the parameter dependent variables like CNSR, ADT, STARTDT, EVNTDESC, SRCDOM, PARAMCD, … the admiral::derive_param_tte() function can be used.

Sas interview questions oncology adtte adsl adrs