If the Relative Risk option is selected from the graph options menu, the instantaneous relative risk (described in the SURPH.1 manual) as a function of the individual covariate is plotted instead of the survival function. As with the survival function graph, the user may superimpose a histogram of the covariate data on the graph. Note that this is applicable only for the proportional hazards link function.
The user can select from one of three standards for the relative risk graph:
| Mean | Relative risk of 1.0 corresponds with the mean covariate value (the default, as sho wn below). |
| Minimum | Relative risk of 1.0 corresponds with the minimum covariate value |
| Maximum | Relative risk of 1.0 corresponds with the maximum covariate value |
Note that the above relative risk curve is only applicable when the hazard
link function is used to model survival probabilities.
