Parametric Accelerated Failure Time Models: Model
This feature requires SPSS® Statistics Standard Edition or the Regression Option.
Model
An optional panel to specify the model options and settings.
- Distribution of Survival Time
- An option to specify the distribution of the survival time.
- Weibull
- Specifies Weibull distribution. This is the default setting.
- Exponential
- Specifies exponential distribution.
- Log-Normal
- Specifies log-normal distribution.
- Log-Logistic
- Specifies log-logistic distribution.
- Covariate Settings
- Specify covariate variables.
- Factor Settings
- Specify factor variables.
- Initial Value of Intercept
- An option to specify the initial value of the intercept term. If specified, it must be a single numeric value, and cannot be 0.
- Initial Value of Scale Parameter
- An option to control the setting of the scale parameter.
- Standard error of the corresponding OLS regression
- Uses the standard error of the corresponding ordinary least squares regression as the initial value.
- Inverses standard error of the corresponding OLS regression
- Uses the reciprocal of the standard error.
- User-supplied value
- If a single numeric value is specified, the value is used as the initial value. If specified, it must be greater than 0.