adding docs

[aysim319]

add docs for NHSN data

Addresses #1569

[aysim319]

also noticed that NSSP isn't mentioned in the https://cmu-delphi.github.io/delphi-epidata/api/covidcast_signals.html at the dashboad signals page when is it in the public dashboard.

[nmdefries]

Is "reporting dates" what we're calling "time values" now? I think someone was working on defining new official terminology

[nmdefries]

Requesting more detail in some sections.

[aysim319]

Is "reporting dates" what we're calling "time values" now? I think someone was working on defining new official terminology

I've been using the column names that's in the api for consistency sake, but if reporting dates are the main vocab i can change it

[aysim319]

@nmdefries from the comment that I couldn't make a reply for:

Total number of patients hospitalized with confirmed COVID-19 over the entire week (Sunday – Saturday). This is preliminary data that is <...whatever that means>. Only includes hospitalizations reported before Wednesday of the following week.
Make sure to clarify what "preliminary data" means -- my initial point of confusion is that the prelim and non-prelim data seem to be reported at the same time and for the same week. So what's the difference?

the preliminary comes few days earlier, both will report the same latest reporting week, but compared to the main one which you would have to wait a full weeks (friday-saturday) to pass, the preliminary data comes wednesday-ish.

preliminary (*last updated jan 2nd)

main (*last updated jan 3rd)

*I believe that fluview mentioned that for the week of the new years the reporting updates would be delayed

[nmdefries]

Is "reporting dates" what we're calling "time values" now? I think someone was working on defining new official terminology

In my edit, I switched all mentions of "reporting date" to "reference date" for clarity. I think "reporting date" sounds like it means "report date"/"issue date".

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
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0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nmdefries]

This is good, except for the failing test.