Catalogues of Resolution IV 128 Run 2-Level Fractional Factorials Up to 33 Factors that Do Have 5-Letter Words R package FrF2.catlg128 version 1.2-4 CRAN Task View: ExperimentalDesign (https://CRAN.R-project.org/view=ExperimentalDesign) Catalogues of resolution IV regular fractional factorial designs in 128 runs are provided for up to 33 2-level factors. The catalogues are complete, excluding resolution IV designs without 5-letter words, because these do not add value for a search for unblocked clear designs. The previous package version 1.0 with complete catalogues up to 24 runs (24 runs and a namespace added later) can be downloaded from the authors website. Software Depends: R(>= 2.13.0), FrF2(>= 1.4) Ulrike Groemping <ulrike.groemping@bht-berlin.de> Comprehensive R Archive Network (CRAN) Ulrike Groemping [aut, cre] GPL (>= 2) 2025-09-03 application/tgz https://CRAN.R-project.org/package=FrF2.catlg128 doi:10.32614/CRAN.package.FrF2.catlg128