(2007) report an increase of about 3% accuracy on adaptation of POS tagging from Modern English texts to Early Modern English texts if the target texts were automatically normalized by the VARD system.
normalization is not always a well-defined problem (Eisenstein, 2013), and it does not address the full range of linguistic changes over time, such as unknown words, morphological differences, and changes in the meanings of words (Kulkarni et al., 2015).