Flexible Latent Trait Metrics using the Filtered Monotonic Polynomial Item Response Model R package flexmet version 1.1 Application of the filtered monotonic polynomial (FMP) item response model to flexibly fit item response models. The package includes tools that allow the item response model to be build on any monotonic transformation of the latent trait metric, as described by Feuerstahler (2019) <doi:10.1007/s11336-018-9642-9>. Software Suggests: MonoPoly, knitr, rmarkdown, mirt Leah Feuerstahler <lfeuerstahler@fordham.edu> Comprehensive R Archive Network (CRAN) Leah Feuerstahler [aut, cre] GPL-3 2021-07-13 application/tgz https://CRAN.R-project.org/package=flexmet doi:10.32614/CRAN.package.flexmet