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Plot survival function of Cox proportional hazards model

`plotSurvival(`

plots the baseline
survival function of a Cox proportional hazards model `coxMdl`

)`coxMdl`

. The
survival function at time `t`

is the estimated probability of survival
until time `t`

. The term *baseline* refers to the
survival function at the determined baseline of the predictors. This value is stored in
`coxMdl.Baseline`

, and the default value is the mean of the data set used
for training.

`plotSurvival(`

plots the survival function for the given value of the stratification variable
`coxMdl`

,`X`

,`Stratification`

)`Stratification`

. You must have one row in
`Stratification`

for each row in `X`

.

**Note**

When you train `coxMdl`

using stratification variables and
pass predictor variables `X`

,
`plotSurvival`

also requires you to pass
stratification variables.

`graphics = plotSurvival(___)`

returns an array of
`Stair`

graphics objects. See Stair Properties.