Provides methods for Neutrosophic Analysis of Variance (NANOVA) and Neutrosophic Analysis of Covariance (NANCOVA) for crossover designs, as well as NANOVA for multi-session designs with direct and residual effects using interval-valued observations. For crisp data, users can enter identical lower and upper values for the response and covariate variables to obtain results equivalent to classical Analysis of Variance (ANOVA) and Analysis of Covariance (ANCOVA), respectively. The basic concepts of neutrosophic statistics are based on Smarandache (2014) < https://fs.unm.edu/NeutrosophicStatistics.pdf>, while the analysis procedures implemented in this package are newly developed.