afttest: Model Diagnostics for AFT Models
================

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The R package **afttest** is intended to be a user-friendly *supplementary*
package to the base package **aftgee**.

## Features
In addition to the R interface, **afttest** provides a C++ header-only library 
integrated with **Rcpp**, which allows the construction of spline basis 
functions directly in C++ with the help of **Rcpp** and **RcppArmadillo**. 

## Installation of CRAN Version
You can install the released version from
[CRAN](https://CRAN.R-project.org/package=afttest).

``` r
install.packages("afttest")
```

## Development
The latest version of the package is under development at
[GitHub](https://github.com/WoojungBae/afttest). If it is able to pass
the automated package checks, one may install it by

``` r
if (!require(devtools)) install.packages("devtools")
devtools::install_github("WoojungBae/afttest")
```

## Performance
The implementation of the main functions has been written in C++ with the 
help of the **Rcpp** and **RcppArmadillo** packages. The computational 
performance has thus been boosted.

## Reference 
Bae, W., Choi, D., Yan, J., Kang, S. (2025). afttest: model diagnostics for 
semiparametric accelerated failure time models in R. *arXiv*, 
**arxiv.org/abs/2511.09823**.

Choi, D., Bae, W., Yan, J., and Kang, S. (2024). A general model-checking 
procedure for semiparametric accelerated failure time models. 
*Statistics and Computing*, **34**(3) 117

Bae, W., Choi, D., Yan, J., Kang, S. (2022). afttest: Model Diagnostics for 
Accelerated Failure Time Models. *CRAN*, **CRAN.R-project.org/package=afttest**.

Chiou, S., Kang, S., and Yan, J. (2014). Fitting accelerated failure time model 
in routine survival analysis with R package aftgee. 
*Journal of Statistical Software*, **61**(11): 1--23. 