“We found the basic reproduction number, R_0, to be around 2.2 (90% high density interval 1.4--3.8), ...” “Transmission characteristics appear to be of a similar magnitude to severe acute respiratory syndrome-related coronavirus (SARS-CoV) and the 1918 pandemic influenza.”https://twitter.com/biorxivpreprint/status/1220871624594948107 …
Different estimates here: Novel coronavirus 2019-nCoV: early estimation of epidemiological parameters and epidemic predictionshttps://www.medrxiv.org/content/10.1101/2020.01.23.20018549v1 …