I have played around a little with the state data and I looked through your notebook closely to see if I could figure out a way to enhance the analysis to identify clusters of states that are testing a lot and clusters that are testing only those with obvious symptoms so that I could then estimate a sequence of percentage positive tests over time and see if they start to converge.
Then the absolute counts of positives could be used to estimate if we had turned a corner, at least in those jurisdictions with sufficient testing.
But the data are too thin and there just does not seem to be any state that is testing as much as NY. Maybe in a few days.