Package: MAI Type: Package Title: Mechanism-Aware Imputation Version: 1.9.0 Authors@R: c(person(given = "Jonathan", family = "Dekermanjian", role = c("aut", "cre"), email = "Jonathan.Dekermanjian@CUAnschutz.edu"), person(given = "Elin", family = "Shaddox", role = c("aut"), email = "Elin.Shaddox@CUAnschutz.edu"), person(given = "Debmalya", family = "Nandy", role = c("aut"), email = "Debmalya.Nandy@CUAnschutz.edu"), person(given = "Debashis", family = "Ghosh", role = c("aut"), email = "Debashis.Ghosh@CUAnschutz.edu"), person(given = "Katerina", family = "Kechris", role = c("aut"), email = "Katerina.Kechris@CUAnschutz.edu")) Description: A two-step approach to imputing missing data in metabolomics. Step 1 uses a random forest classifier to classify missing values as either Missing Completely at Random/Missing At Random (MCAR/MAR) or Missing Not At Random (MNAR). MCAR/MAR are combined because it is often difficult to distinguish these two missing types in metabolomics data. Step 2 imputes the missing values based on the classified missing mechanisms, using the appropriate imputation algorithms. Imputation algorithms tested and available for MCAR/MAR include Bayesian Principal Component Analysis (BPCA), Multiple Imputation No-Skip K-Nearest Neighbors (Multi_nsKNN), and Random Forest. Imputation algorithms tested and available for MNAR include nsKNN and a single imputation approach for imputation of metabolites where left-censoring is present. License: GPL-3 Encoding: UTF-8 Imports: caret, parallel, doParallel, foreach, e1071, future.apply, future, missForest, pcaMethods, tidyverse, stats, utils, methods, SummarizedExperiment, S4Vectors biocViews: Software, Metabolomics, StatisticalMethod, Classification Suggests: knitr, rmarkdown, BiocStyle, testthat (>= 3.0.0) VignetteBuilder: knitr Config/testthat/edition: 3 URL: https://github.com/KechrisLab/MAI BugReports: https://github.com/KechrisLab/MAI/issues