Two conventions are allowed (see Exact Failure Times versus Interval Censoring for more information):
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Other details are analogous to those described for Time to Event Format in the section Time to Event. See also Exact Failure Times versus Interval Censoring for more information.
Reliability growth programs often involve several periods, or phases, of active testing. These testing phases can be specified in the optional Phase column. For the Time to Event Format and Dates Format data formats, the Phase variable can be of any data or modeling type. For the Parallel Systems data format, the data type of the Phase variable must be Numeric. For details about structuring multi-phase data, see Test Phases. For an example, see Piecewise NHPP Weibull Model Fitting with Interval-Censored Data.