Wednesday, April 8, 2020

Interesting and Somewhat Contrarian Covid-19 Data

  • The picture above circulates on Twitter but the URL for the CDC website does not match what is shown. If the data are correct, they suggest fewer deaths from pneumonia since November 2019 because more deaths were likely attributed to Covid-19.










Saturday, April 4, 2020

Coronavirus: Light at the End of the Tunnel


  • On March 11, the World Health Organization declared a Covid-19 pandemic
  • On March 12, Hawaii decided that all large events are canceled. Disneyland announced its closing.
  • On March 13, Pres. Trump declared a 'state of emergency' in the U.S.
Right then I started collecting data for the World and for the US. All my data were taken around noon from ncov2019.live, and rounded up to nearest hundred cases.

Here is the summary of my data and projections which suggest that there is light at the end of the tunnel.


The first three graphs show the number of cases for three weeks starting in mid-March. The second graph suggests that a change has occurred and that the rate of daily growth has started declining. The third graph suggests that daily growth has become 'permanently' under 20% and declining. The fourth graph summarizes these three weeks of 21 daily data points and shows a clear downward trend.

In this writing, the last data point was collected at noon on April 4. Where do we go from here? 

If the rate of decline is slow, as the third graph suggests, then the shape of new cases will follow the red line on the bottom graph. New cases will peak at the very end of April. Around mid-May, the new cases in the US will be the same as now at about 300,000 per day. This is a likely scenario. The likely maximum of infections in the U.S will be about 35 million, and the maximum of new daily cases of will be about 1.2 million.

If the rate of decline is fast, as the fourth graph suggests, then the shape of new cases will follow the yellow line on the bottom graph. New cases will peak around April 15 and on May 15, the US will record only 100 new cases. This is a wonderful statistical outcome but not likely to occur unless the mitigations, warm weather and other factors serendipitously conspire to put a lid on this pandemic. Even under this optimistic scenario, the number of infections in the U.S will be about 12 million.

I'll keep following the numbers but indeed there are statistical indications that there is an end to the 'Covid-19 tunnel' in late spring.

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There is great risk in making forecasts using only a few and fairly volatile data points. Every week adds precious new data that enable better future predictions. I will leave this post alone and will post updates separately. In this way, we can see how close we got in predicting 6 weeks into the future based on 3 weeks in the past.

Wednesday, February 5, 2020

How Much Do We Pay for Roads and Other Utilities?

Robert Poole of the Reason Foundation presented a comparison below in which I added my data from Honolulu, Hawaii. Thanks to the 12 solar panels on the roof of my house, and my moderate annual mileage (about 11,000 miles at 20 mpg), my costs are similar or better than average US costs.

However, the data below do not include vehicle registration fees which are part of the road charges we pay. My vehicle's registration is just under $30 per month but most light duty trucks pay about $500 for registration on Oahu, which is over $40 per month. Even with registration included, the conclusion is the same. Roads are a vital infrastructure utility and we pay less for them than we pay for other infrastructure utilities.


=========== Poole's article:What Americans Pay in Highway User Taxes  ===========

HNTB Corporation last month put out a useful analysis that compares what Americans pay for roads and highways (via gasoline taxes) with what they pay for other basic infrastructure, such as electricity, water, cell phones, broadband, etc. I was not surprised to see that their results showed a far lower annual cost to use roadways (excluding tolled facilities) than for other user-charge-funded infrastructure. But I was surprised by how low the reported gas tax charge was.

In my book, Rethinking America’s Highways (University of Chicago Press, 2018), I presented a similar comparison, using data mostly from 2012-2013. My results were very similar to HNTB’s, except for the highway number. The comparative monthly figures are shown above.

My numbers make the same basic point—that people don’t realize how little they pay for roads compared with other basic infrastructure. But my fuel tax figure is about double that of HNTB. The answer appears to be that all HNTB’s figures are per household, except for fuel tax, which is per driver. By contrast, all of mine, including fuel tax, are calculated on a per-household basis.

I’m grateful to HNTB for making this kind of comparison, but we should not be presenting an unfairly low figure for what households pay for roads. The main point is to get people to understand that even $46 per household per month is far below what they pay for other basic infrastructure and is not sufficient to cover the capital and operating costs of our extensive roadway network.

Sunday, September 15, 2019

Uber's Days Are Numbered

I have been saying this privately and on my Facebook page for at least two years. Uber's days are numbered. We just don't know exactly when it'll collapse. It really depends on the amount of fools willing to help it burn capital. Now hear it from Princeton's Alain Kornhauser below. (The linked article dances around the truth and provides vague and false hope.)

"At the size that they are now, neither Lyft or Uber are close to break-even. If they grow, it gets worse (unit labor charges go up and average revenue goes down, fundamental supply - demand). Driverless in a sufficiently large Operational Design Domain to substantially increase their size in not going to happen soon enough to save them as they exist today. They were just too early.

Their only "survival" option is to downsize by a factor of at least 10, reduce their valuation/stock price by a factor of at least 10. Become a "nice business" for 5-10 years and wait for Driverless aTaxis to become a reality and start this all over again.

Driverless is a necessary condition to make this into a network non-labor intensive business. Alain"