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Survival Distributions

Select menu: Stats | Survival Analysis | Parametric Models

Models survival times assuming that they follow either an exponential, Weibull, extreme-value, log-logistic or lognormal distribution. It caters for right-censored observations, where the subject concerned survived the trial. The log-logistic distribution can be used to cater for left-censored observations.

  1. After you have imported your data, from the menu select 
    Stats | Survival Analysis | Parametric Models.
  2. Fill in the fields as required then click Run.

You can set additional Options then after running, you can save the results by clicking Save.

Available data

This lists data structures appropriate to the current input field. The contents will change as you move from one field to the next. You can double-click a name to copy it to the current input field or type it in.

Time points

Time of each observation.


Variate containing the values 0 and 1 to indicate whether the corresponding time point is censored (1) or not (0). For the log-logistic distribution left censored observations can be specified by using -1.


Distribution of the survival times. Can be either Exponential, Weibull, Extreme value, Log-logistic and Lognormal.


The model terms to be fitted are specified by entering a model formula.

See also

Updated on March 25, 2019

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