fix: add missing county level to quidel

[sgratzl]

according to meta data we have it

closes #539

Prerequisites:

• Unless it is a hotfix it should be merged against the dev branch
• Branch is up-to-date with the branch to be merged with, i.e. dev
• Build is successful
• Code is cleaned up and formatted

Summary

according to meta data we have it

[capnrefsmmat]

This may have been a deliberate decision because of low sample sizes, although it looks like that has gotten better in the past month or so. We might get someone to play with the preview for a minute to see if they think the Quidel county signal is available at enough counties to release.

[capnrefsmmat]

@jingjtang Viz is considering turning on county-level maps for the Quidel COVID tests. Do you recall why we originally didn't have this? Was it just the sample size? If so, is the sample size large enough now that we should turn it on?

[jingjtang]

@capnrefsmmat This figure shows the number of counties available to be reported, the requirement is

• Sample size >= 50 for raw
• Sample size >0 for smoothed

[capnrefsmmat]

Since we display the smoothed signal on the map, I think we can go ahead and display the smoothed Quidel signal at the county level. @jingjtang There isn't any reason that counties are not comparable or are misleading, right?

[jingjtang]

@capnrefsmmat They should be comparable among counties since we report percent of positive tests which are number of positive tests / number of total tests * 100 for a certain location in a certain time period.

There is only one concern left. We have add an extra threshold for geographical pooling as stated here. The code has been finished, but the data in the system has not been updated(all the data back to May 26) and the documentation for the API is left as the old version. What is the time point to do the two things? (@krivard is not here this week) I think we should do these two things together so that the documentation for the API is consistent with the data people get from our API.

This change will lead to fewer counties available since we only report counties with sample size >= 30 as shown below. (sorry, the figure that I posted previously is for the old version, corrected in the last comment).

The requirement is

• Sample size >= 50 for raw
• Sample size >=30 for smoothed
  

[netlify]

Preview link ready!

Built with commit cc537c9

https://deploy-preview-460--cmu-delphi-covidcast.netlify.app

[tildechris]

Since we now have #544 to explicitly mention coverage, I think it's reasonable to enable this signal at the county level.