What problems are associated with using the following simple imputation methods to deal with missing values: (a) mean imputation; (b) LOCF; (c) simple imputation using regression? Very briefly,...

What problems are associated with using the following simple imputation methods to deal with missing values: (a) mean imputation; (b) LOCF; (c) simple imputation using regression?

Very briefly, summarise the MICE, FIML, EM, MissForest, and the Nearest Neighbour imputation procedures.