Neutrosophic Analysis of Completely Randomized Designs and Randomized Complete Block Designs R package NeutroCrdRcbdAnalysis version 0.0.1 Provides neutrosophic analysis of variance (NANOVA) and analysis of covariance (NANCOVA) for Completely Randomized Designs (CRD) and Randomized Complete Block Designs (RCBD) using interval-valued observations. Computes interval sums of squares, mean squares, F-statistics, significance tests, and interval-based least significant difference (LSD) comparisons. When lower and upper observations are identical (crisp data), the methods reduce to the corresponding classical ANOVA and ANCOVA. Software Imports: MASS, stats Vinaykumar L.N. <vinaymandya123@gmail.com> Comprehensive R Archive Network (CRAN) Neethu R.S. [aut, ctb], Boyina Devi Priyanka [aut, ctb], Cini Varghese [aut, ctb], Mohd Harun [aut, ctb], Anindita Datta [aut, ctb], Vinaykumar L.N. [aut, cre] GPL-3 2026-07-22 application/tgz https://CRAN.R-project.org/package=NeutroCrdRcbdAnalysis doi:10.32614/CRAN.package.NeutroCrdRcbdAnalysis