Data Sources: Cases and deaths data from JHU CSSE. As of August 1, 2020, policy events are drawn from from various state-specific sources. Prior to that, the data source for policy events was the National Governor’s Association.
Our data provider, The Covid Tracking Project, is in the process of changing how it maps states’ data to the categories we use for our positivity calculations. These changes mean the category of data we use in our denominator (Total tests) may now include tests previously not included in our calculations, which in turn may result in a test positivity calculation that is lower than what we would have calculated for the state prior to the change.
With this significant change, we will once again review our data inputs and calculations to ensure that our numbers reflect the most responsible public health calculation of test positivity.