They found that changes in the rate of spread and the timing of peak mortality each year correlated with yearly fluctuations in monthly airline passenger volume.
Professor Krieger investigated changes in the rate of premature mortality (dying before the age of 65) and infant death from 1960 to 2002.
Britain has recorded stronger growth than other major European economies, but the recovery has been gradual and economists are not expecting changes in the rate until next year.
The economy fluctuates with changes in the rate of growth in government employment and in government-funded construction activities.
This emphasizes the importance of nontidal effects in producing changes in the rate of Earth's rotation period.
"It can be very difficult to decide if changes in the rate of earthquakes or volcanoes have actually happened," Duncan Agnew, a geophysicist at the Scripps Institution of Oceanography, wrote in an e-mail.
The level of and changes in the rate also indicate the view of the central bank on the desirability of greater tightness or ease in credit conditions.
And the Fed may have concluded that American inflation is less sensitive than it was to changes in the rate of unemployment.
Background: There have been dramatic changes in the rate of inflation in recent years.
The non-stationary ETAS model describes changes in the rate of background seismicity of swarm activity.
These translate to changes in the rate of electron transfer or kinetics of an electrochemical reaction.
