# Probability of Remaining in Progression Between Two Time Points for Different Transition Models

Source:`R/corPFSOS.R`

`log_p11.Rd`

Probability of Remaining in Progression Between Two Time Points for Different Transition Models

## Arguments

- transition
(

`TransitionParameters`

)

see`exponential_transition()`

,`weibull_transition()`

or`piecewise_exponential()`

for details.- s
(

`numeric`

)

lower time points.- t
(

`numeric`

)

higher time points.

## Value

This returns the natural logarithm of the probability of remaining in progression (state 1) between two time points, conditional on being in state 1 at the lower time point.

## Examples

```
transition <- exponential_transition(h01 = 1.2, h02 = 1.5, h12 = 1.6)
log_p11(transition, 1, 3)
#> [1] -3.2
```