We’ve been calculating the Percent Increase of cases in leading and nearby domains. But we have only occasionally referred them to the other way people look at these as how many days does it take to double at given percent increases. On the logarithmic plots of cases, these are the radiating straight lines bounding the evolution graphs. So we have constructed the roots of two to the accuracy which I have been computing the tables.
The square root of two is well known as 1.414. That means that if you compound at 41.4% for two days, you double your initial principal. Here is a table up to a week or seven days of compounding.
| Days to Double. | The root of 2. | The daily percent increase |
| 1 | 2 | 100% |
| 2 | 1.414 | 41.4% |
| 3 | 1.260 | 26.0% |
| 4 | 1.189 | 18.9% |
| 5 | 1.149 | 14.9% |
| 6 | 1.126 | 12.6% |
| 7 | 1.104 | 10.4% |
| 8 | 1.0905 | 9.05% |
| 9 | 1.08o1 | 8.01% |
| 10 | 1.0718 | 7.18% |
I’m really worried at any domain with 26% or higher percent increase. You can see why 19% to 26% is the next category to worry about. For only a one week doubling, you have to get down to 10%.
US deaths are 10,986. This is dominated by New York at 4,758, including 3.485 from New York City. New Jersey is next at 1,003, and then Michigan at 727. California had 388 deaths total.
Remember when the world death rate from the Coronavirus was 3.4%, and Trump argued that it should be much less than 1%? The US Coronavirus death rate is 3.0%, and the California death rate from it is 2.4%.
| Domain | Cases | Percent Increase |
| US | 368,241 | 18.0% |
| NY | 131,815 | 15.5% |
| NJ | 41,090 | 20.4% |
| MI | 17,221 | 21.1% |
| CA | 16,347 | 17.6% |
| LA | 14,867 | 19.0% |
| MA | 13,837 | 17.9% |
| FL | 13,629 | 18.1% |
| PA | 13,206 | 25.7% |
| IL | 12.262 | 18.9% |
| WA | 8,384 | 7,632 |
| TX | 8,154 | 18.7% |
| GA | 7,558 | 18.4% |
| CT | 6,906 | 30.9% |
| CO | 5,183 | 13.5% |
| IN | 4,956 | 25.4% |
| OH | 4,953 | 19.1% |
| MD | 4,045 | 27.5% |
| TN | 3,802 | 14.4% |
| NC | 3,054 | 21.8% |
| VA | 2,878 | 19.6% |
| MO | 2,736 | 16.7% |
| AZ | 2,732 | 22.2% |
| WI | 2,511 | 18.0% |
| SC | 2,232 | 8.93% |
| AL | 2,006 | 8.96% |
| NV | 1,970 | 7.30% |
| Canada | 16,667 | 19.0% |
| Mexico | 2,439 | 29.0% |
| Brazil | 12,232 | 18.1% |
| Los Angeles County | 6,360 | 20.5% |
| Orange County | 882 | 12.2% |
The really fast growths start with Connecticut at 30.9%, Mexico at 29.0%, Maryland at 27.5%, Pennsylvania at 25.7%, and Indiana at 25.4%. A lot of states and Los Angeles were in the 20% region, and the entire US is at 18.0%, which doubles in about 4 days, as does Canada.
