Estimation of true number of COVID-19 infected people in Japan using LINE questionnaire

Shin-ichiro Tanaka; Shinya Oku

is the (which was not peer-reviewed) The copyright holder for this preprint . https://doi.org/10.1101/2020.04.15.20066100 doi: medRxiv preprint prefectures. Putting Hokkaido aside, the 3 prefectures have smaller populations and incidental increase of infection and/or high-fever might arise. It was not quite explicable that Hokkaido is out of the general order, however, its vast surface area and extremely low population density other than Sapporo and some other outstanding cities might influence and its comparison with other prefectures remains challenging. At any rate, as excluding the extraordinary observation data is a common statistical technique, the authors decided to use the remaining 43 prefectures. As a further note, Tokyo, which has a combination of high accumulated number of the positivity and high rate of high-fever, with the thoughts that the population is large enough not to be excluded, the authors dare not exclude and continue to use this despite its plot on the graphic.