
Explain why missing data challenge machine learning, how imputation fits into the pipeline before feature selection and model selection, and outline MCAR, MAR, MNAR mechanisms.
Please DON'T impute the data as pd.Dataframe! Use data.T, to transpose the data as code expects rows to be features and columns to be samples. ( it reverses it in the first step of fit/transform! )
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Learn mean imputation for numeric features and mode imputation for categorical features using Python and scikit-learn, then train on the data and apply imputations to both train and test.
Impute missing data with knn imputation by scaling numeric features, applying one-hot encoding to categoricals, and using euclidean distance with cross-validation to optimize the number of neighbors.
Discover how probabilistic PCA, soft impute, and denoising autoencoders handle missing data by iteratively imputing, transforming to latent space, and reconstructing in the original space.
Analyze why missing data hinder learning, identify missing completely at random, missing at random, and missing not at random, and compare simple imputation with advanced methods like Miss Forest.
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