R package ChainLadder: Statistical methods for the calculation of outstanding claims reserves in general insurance. The ChainLadder package provides various statistical methods which are typically used for the estimation of outstanding claims reserves in general insurance. The package has implementations of the Mack, Munich, Bootstrap, multivariate, and chain-ladder factor models (CLFM), as well as the loss development factor curve fitting methods of Dave Clark and generalised linear model based reserving models.