# survivalmodels

## What is survivalmodels?

`survivalmodels`

implements models for survival analysis that are either not already implemented in R, or novel implementations for speed improvements. Currently implemented are five neural networks from the Python packages pycox, DNNSurv, and the Akritas non-parametric conditional estimator. Further updates will include implementations of novel survival models.

For a hands-on demonstration of model training, tuning, and comparison see this article I wrote, which uses the mlr3proba interface with models from `survivalmodels`

.

## Basic Usage

```
# load dependencies
library(survival)
train <- simsurvdata(100)
test <- simsurvdata(50)
fit <- akritas(Surv(time, status) ~ ., data = train)
predict(fit, newdata = test)
# Use distr6 = TRUE to return a distribution
predict_distr <- predict(fit, newdata = test, distr6 = TRUE)
predict_distr$survival(100)
# Return a relative risk ranking with type = "risk"
predict(fit, newdata = test, type = "risk")
Or both survival probabilities and a rank
predict(fit, newdata = test, type = "all", distr6 = TRUE)
```

## Python Models

`survivalmodels`

implements models from Python using reticulate. In order to use these models, the required Python packages must be installed following with reticulate::py_install. `survivalmodels`

includes a helper function to install the required `pycox`

function (with pytorch if also required). Before running any models in this package, if you have not already installed `pycox`

please run

`install_pycox(pip = TRUE, install_torch = FALSE)`

With the arguments changed as you require, see ?install_pycox for more.

For `DNNSurv`

the model depends on `keras`

and `tensorflow`

, which require installation via:

`install_keras(pip = TRUE, install_tensorflow = FALSE)`

## Installation

Install the latest release from CRAN:

`install.packages("survivalmodels")`

Install the development version from GitHub:

`remotes::install_github("RaphaelS1/survivalmodels")`