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Where Does Our Data Come From?

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Want to know where Covid Act Now’s data comes from? We’ve created an easy-to-follow slide deck to answer all your questions about where we get the data that feeds our modeling and metrics.  Our guiding principles for selecting data sources are available, authoritative, timely, and open. The slides explain the inputs for each of our metrics (e.g., the number of new daily COVID cases or the...

Our Newest Metric: Contact Tracing

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Today, Covid Act Now is excited to announce a fourth metric added to our COVID warning system: contact tracing. We will layout how we calculate whether states have sufficient contact tracing capacity, and why we think it is an important metric to assess reopening. Why Does Contact Tracing Matter? When people contract the virus, they do not show symptoms right away. Even as states begin to reopen...

Changes to Model Parameters

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Covid Act Now recently changed a few of its model parameters. We wanted to share what changed and why. The epidemiological model we use to track COVID is an SEIR model. An SEIR epidemiology model tracks the flow of a population between four states in relation to a disease (in this case, COVID). Those four states are susceptible (S), exposed (E), infected (I), and recovered (R). Mash those four...

A Dashboard to Help America Reopen Safely

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Note: This blog post is a higher-level description of Covid Act Now‘s four COVID metrics. For a more technical, “kitchen sink” description of assumptions and methodology, please see our references and assumptions document, along with our data sources presentation. Fighting COVID is hard, but understanding where we stand against COVID just got easier. A policy consensus is...

Exporting Covid Act Now Data to a Spreadsheet

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If you’re more familiar with editing or manipulating a spreadsheet than you are with code, we have good news! You can now export the data from Covid Act Now‘s model to your favorite spreadsheet, such as Google Sheets or Microsoft Excel. The Covid Act Now API, which we launched yesterday, exports in CSV (comma separated value) format. This format can be easily imported into a...

Announcing the CovidActNow.org API

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Covid Act Now (CAN) is a non-profit organization of technologists, epidemiologists, and medical professionals working to model how COVID-19 will spread in each U.S. state and county.  We published the first version of our model on March 20. Since then, 10+ million Americans have viewed the model and we’ve engaged with dozens of government officials, including the U.S. Military and White...

Inference Projections for States

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Today, Covid Act Now’s U.S. Interventions Model launched inference projections at the state level. You can see inference projections on state graphs at Covid Act Now under the purple label, “projected based on current trends.”

Covid Act Now & IHME: Why Two Models Are Better Than One

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IHME and Covid Act Now's U.S. Interventions Model are two common forecasting tools used by decision-makers in the United States. We often get asked how these two models compare. This blog post lays out the answer to that question, to help bring clarity to the conversation around COVID-19 modeling.

Dr. Nirav Shah Discusses Covid Act Now Model

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Marcus Plescia, MD, MPH, ASTHO's Chief Medical Officer, speaks with Covid Act Now's Nirav Shah, MD, MPH, former commissioner of the New York Department of Health, about modeling and its use during COVID-19. Shah also discusses limitations with models, what types of data may be included, and some important considerations in choosing a model. Watch and learn more...

Early Action Saves 91,000 Lives

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When pandemic strikes, early action saves lives. In the case of the United States, early moves to stay at home mean 43,000 lives have been saved so far. Read on to learn more...


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