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The COVID Tracking Project Profile picture
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11 Mar, 5 tweets, 2 min read
We’ve concluded our data collection, but fear not: we’ve put together a bunch of resources to help you find COVID data.
First, here’s all the data and metadata we collected over the past year. covidtracking.com/about-data/dat…
If you’d like to see charts and data visualizations, here’s where to find simple topline data. covidtracking.com/analysis-updat…
If you’re an advanced user who needs to download and query data, here’s a guide that includes our data training sessions and presentations in addition to links to federal datasets.
covidtracking.com/analysis-updat…
And here’s a comprehensive guide to federal data resources and what we know about them. covidtracking.com/about-data/fed…

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More from @COVID19Tracking

The COVID Tracking Project Profile picture
8 Mar
Our daily update is published. States reported 1.2 million tests, 41k cases, 40,212 hospitalized COVID-19 patients, and 839 deaths. This is our final day of data collection after a very long year. 4 bar charts showing key COVID-19 metrics for the US over ti
The project was initially created to track testing. The first few days, states reported just a few thousand total tests. Today, states reported 1.2 million tests. The single-day high for the year was December 5 at 2.3 million. Cumulatively, we've tracked 363 million tests. A bar chart showing cumulative tests reported in the United
We ended up tracking other metrics. Cases reached heights we never could have imagined in the early days. The 7-day average got to 250 thousand cases per day in early January. Today, states reported the fewest number of cases since October 6, before the winter surge. A bar chart showing daily reported cases
Read 14 tweets
The COVID Tracking Project Profile picture
6 Mar
In the last of our rolling updates to our totalTestResults API field before we end data collection tomorrow, we switched totalTestResults for MT, NM, and WV from summing positive+negative to drawing data directly from totalTestsViral.
covidtracking.com/about-data/tot…
These changes close the book on work we began in August 2020 to improve the data in totalTestResults. When our project began, most states shared positive and negative results only, so we summed those figures to calculate totals for every state.
covidtracking.com/analysis-updat…
Switching each state’s totalTestResults from calculated to explicit numbers required getting complete historical testing data from states. We tried to get the data in units of tests—not people—because counting tests better captures testing volume.
Read 5 tweets
The COVID Tracking Project Profile picture
6 Mar
Our daily update is published. States reported 1.7M tests, 69k cases, 42,541 currently hospitalized, and 2,221 deaths.

This is our final weekday update. We'll tweet our last daily data this Sunday, though we will periodically post deeper analysis beyond that date. Alt: 4 bar charts showing key COVID-19 metrics in the US. St
Currently hospitalized is under 50 per million people in 8 states, up from only 2 states in early February. Alt: Cartogram showing the number of patients currently hosp
7-day average cases are down over 10% week over week in all US regions save the Northeast. However, testing in the Northeast is up much more than cases in the same period. Alt: bar charts showing cases and tests for COVID-19 in the
Read 5 tweets
The COVID Tracking Project Profile picture
5 Mar
The COVID Tracking Project is ending data collection this Sunday. As part of our wind down process, we are for the first time publishing our full data annotations, a set of structured metadata on how states define their COVID-19 metrics.
covidtracking.com/analysis-updat…
Health data pipelines in the US are siloed, with each state running its own pipelines to collect data on COVID-19’s spread. In the absence of federal guidelines, and constrained by technical limitations of their systems, many of them use different data definitions.
Definitions are often relegated to small footnotes on state dashboards. But they make a big difference in the data: They can tip the scale between labeling a COVID-19 case as active versus recovered, or between counting or not counting some COVID-19 cases and deaths at all.
Read 5 tweets
The COVID Tracking Project Profile picture
5 Mar
Since The COVID Tracking Project is winding down on March 7, we’re packaging up what we’ve learned about federal COVID-19 data in a 101 series. Up today: federal testing data. covidtracking.com/analysis-updat…
Unlike case, death, and hospitalization data, federal testing data doesn’t match well to the state data we collect. The discrepancies point to problems with both state and federal data sources. Our deep dive on that: covidtracking.com/analysis-updat…
Thankfully, federal testing data is standardized, unlike our patchwork testing dataset. But the data can be incomplete—especially in 5 states that still can’t submit data to the federal government: A flowchart shows the path of testing data from laboratories
Read 4 tweets
The COVID Tracking Project Profile picture
5 Mar
For our API users: Yesterday, we switched totalTestResults to use values from totalTestsViral instead of being calculated from positive+negative in 4 states: IL, ME, MI, and SD.
These switches caused the totalTestResults field to increase by ~325k (cumulatively). The increases were driven by MI and SD, because our old totalTestResults counted MI positives and SD positives and negatives in units of unique people instead of specimens.
To get more testing history, we changed ME’s testing data source to one that counts residents only instead of residents and nonresidents. ME’s other COVID-19 data only counts residents, so the new source better matches the rest.
Read 5 tweets

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