when to use pca in a data block how is pca used for data what is pca used for in statistics what is pca on uneven length why is pca useful what is the purpose of an unbalanced data matrix with pca? why does pca work in uneven data sets if pca is applied to unbalanced data how does this work? what is the purpose of a pca on missing data why does pca work on data with unequal length how to apply pca on uneven length why should pca be performed with uneven length can pca be done on uneven lengths of data how do a pca work in missing data pca for uneven data length do we need pca for data mitror how does the em algorithm work when to use an unmatched data matrix as pca can pca estimate the mean of the matrix what would be the function of pca on missing data