TiagoOlivoto/metan v1.4.0

Bug fixes Factor columns can now have custom names rather than ENV, GEN, and REP only (#2). New functions gmd() a shortcut to get_model_data() gtb() to generate a genotype-by-trait biplot. gamem_met() to analyze genotypes in multi-environment trials using mixed- or random-effect models allowing unbalanced data. Thanks to @EderOliveira for his e-mail. has_class() to check if a class exists. impute_missing_val() to impute missing values in a two-way table based on Expectation-Maximization algoritms. non_collinear_vars() to select a set of predictors with minimal multicollinearity. replace_na() to replace NA values quicly. random_na() to generate random NA values based on a desired proportion. Minor changes gge(), performs_ammi(), waas(), and waasb() now handle with unbalanced data by implementing a low-rank matrix approximation using singular value decomposition to impute missing entires. Imputation generates a warning message. NA values are checked and removed with a warning when computing stability indexes. Thanks to @MdFarhad for alerting me. New argument plot_res in path_coeff() to create a residual plot of the multiple regression model. Update the citation file to include the published official reference. Argument verbose deprecated in functions anova_ind() and split_factors() Argument rep deprecated in functions Fox(), Huehn(), superiority(), and Thennarasu(). Deprecated argument means_by removed in functions can_corr() and clustering(). Deprecated argument verbose removed in functions colindiag() and split_factors(). Deprecated argument values removed in functions desc_stat() and find_outliers(). Deprecated argument var removed in function desc_wider(). Remove dependency on lattice by using ggplot2 in plot.resp_surf(). An up-to-date cheat sheet was included