Parametric Shared Frailty Models
A Parametric Shared Frailty Models Survival analysis starts the parametric survival models procedure with recurrent life time data input. Parametric survival models assume that survival time follows a known distribution, and this analysis incorporates a frailty term into a parametric survival model. It is treated as a random component to account for an unobserved effect due to individual or group level variability.
Obtaining a Parametric Shared Frailty Models analysis
This feature requires SPSS® Statistics Standard Edition or the Advanced Statistics Option.
 From the menu, choose:
 Select a source variable.
 Time

 Survival

Survival time is represented by one variable to denote the end time. The start time would be set to 0.
 Start / End
 Numeric variables that denote Start Time and End Time.
 Subject

Required to run the procedure. Specifies a single variable for the subject ID.
 Interval
 Specifies a single and numeric variable for the interval number that is used to identify the different recurrent records that share the same subject ID.
 Status
 Single optional string or numeric variable that determines one of the following status settings:
 Failure/Event
 Maps a record to a failure/event category. The default value for a string status variable is F.
 Right Censoring
 Maps a record to a right censoring category. The default value for a string status variable is R.
 Unmapped Values Treatment
 Controls which category to map the unmapped records to. To delete the records that failed to be mapped, select Exclude them from analysis.
 Covariate(s)
 One or more optional numeric variables to be treated as covariates. Note that a variable cannot be specified by both Covariate(s) and Fixed Factor(s).
 Fixed Factor(s)
 One or more optional variables to be treated as factors. A variable cannot be specified by both Fixed Factor(s) and Covariate(s).
This procedure pastes SURVREG RECURRENT command syntax.