add graphs for incidence/R-Value

[rgerhards]

Feature description

Add graphs showing incidence and R-value on a timeline.

Enable user to e.g. click on the daily values and get a graph showing the last n days of the values development. It should be possible to select n from a small set, e.g. "all time", "past 90 days", "past 30 days".

Also, show the last 3 or 4 day numerical values directly on the numerical indicator.

Problem and motivation

CWA currently shows the current day value for incidence and R-Value only. However, both values are dynamic and instable for at least 4 days. This is often misunderstood. Furthermore, press often covers invalid graphs plotting the daily reported R-value instead of the updated values from https://github.com/robert-koch-institut/SARS-CoV-2-Nowcasting_und_-R-Schaetzung/blob/main/Nowcast_R_aktuell.csv. This leads to wrong perception of the development and correctness of the value. The same holds true for the incidence.

This is often being criticized, for real-world arguments have a look at https://twitter.com/RainerGerhards/status/1411757405319438336

Data sources are readily available

• github link above for R
• incidence: https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus/Daten/Fallzahlen_Inzidenz_aktualisiert.html;jsessionid=EE5AC87955DC1EC0267C5D2B11D2861B.internet091?nn=13490888

Very little storage space is required:

• date,
• 7-day r (float)
• incidence (float) If space is ultra-sparse, floats could be encoded as integers where real value r is stored as (int) (r*10 or 100) and r restored before display by appropriate float division.

Is this something you're interested in working on

No (I am not a mobile developer)

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Internal Tracking-ID: EXPOSUREAPP-8289

[heinezen]

@rgerhards

Thanks for your suggestion. I have informed the dev team about your proposals. We will report back here on Github if we get any news on the status of the issue.

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Corona-Warn-App Open Source Team

[lm41]

It would be great if the incidence increase since the last day was displayed.

Tell me if i should open a new Feature Request for that.

[MikeMcC399]

@lm41

It would be great if the incidence increase since the last day was displayed.

Tell me if i should open a new Feature Request for that.

• I had a similar request logged under https://github.com/corona-warn-app/cwa-wishlist/issues/395. I closed it though because trends are already available.

1. Auf der Status-Seite der Corona-Warn-App herunterscrollen bis zum Bereich "Häufige Fragen" und darauf tippen.
2. Im Menu rechts oben, "Analysis" auswählen.
3. Auf der Seite "Corona-Warn-App (CWA): Kennzahlen" bis zum Link "RKI: Covid-19-Trends (DE)" nach unten scrollen.
4. Auf diesen Link tippen.
5. Um beispielsweise den Trend für NRW anzuschauen, bis zur Rubrik "Bundesländer" herunterscrollen.

[rgerhards]

It would be great if the incidence increase since the last day was displayed.

There is a problem with "since last day". The volume of cases changes by Weekday (usually Mondays least, Wednesdays most). While the 7-day incidence takes care of much of the noise, one can see a periodic change in it, too. This is why I asked for a graph.

If a single value is to be given, it would be best to compare not the day before but the same day in the previous week. Removes most of the noise (at least outside of holiday periods).

[MikeMcC399]

@rgerhards

Your suggestion is implemented in CWA 2.28. See https://www.coronawarn.app/en/blog/2022-10-26-cwa-2-28/ which announces the "pandemic radar".

You can access it from the app or directly through https://www.rki.de/DE/Content/InfAZ/N/Neuartiges_Coronavirus/Situationsberichte/COVID-19-Trends/COVID-19-Trends.html?__blob=publicationFile#/home