A Comparison of Tone Normalization Methods for Language Variation Research Jingwei Zhang author 2018-1–3 dec text Proceedings of the 32nd Pacific Asia Conference on Language, Information and Computation Stephen Politzer-Ahles editor Yu-Yin Hsu editor Chu-Ren Huang editor Yao Yao editor Association for Computational Linguistics Hong Kong conference publication zhang-2018-comparison https://aclanthology.org/Y18-1095/ 2018-1–3 dec