[Glücksball]

Zitat von Petar

Also ich würde da "ZOE COVID Study - Help slow the spread of COVID-19" empfehlen. Es gibt auch Übersetzung und Kommentare in einigen dt. Zeitungen, Fachzeitschriften usw.

Ok, wenn das das hier ist, dann sehe ich da gravierende Probleme:
https://en.wikipedia.org/wiki/COVID_Symptom_Study

The COVID Symptom Study requires users to give their location.[13] Users give personal information including age, gender and location, and report if they have any underlying chronic conditions.[17] They also answer questions related to common COVID-19 symptoms, and input any illness or symptoms that they have,[4][2] as well as stating whether they have been tested for COVID-19.[17] Beginning in May 2020, a random sample of users is selected (on the first day they report symptoms) for a swab test.[6] Researchers then use statistical analysis to determine which symptoms are likely to indicate COVID-19,[13] rather than the common cold or seasonal influenza.[2]

Ja, das ist ein Loch, durch das man Güterzüge fahren lassen kann. Neben dem Selektionsbias durch die Selbstauswahl der App-Nutzer.