We estimate the effective reproduction number for 2019-nCoV based on the daily reported cases from China CDC. The results indicate that 2019-nCoV has a higher effective reproduction number than SARS with a comparable fatality rate
The study is not peer-reviewed yet. My guess about the motivation to publish it without being peer-reviewed is the urge for precautionary actions by governments and individuals in order to minimize the spreading out. Prevention is better than cure. Avoid traveling and going to hospitals or to very crowdy places if not really necessary.