These studies compared data from different groups of people at one point in time.
Researchers compared data from two studies of 33,060 runners and 15,045 walkers.
Other innovations came from Cambridge academics, who compared data on deprivation against the use of social media.
It compared data after the the paper erected its paywall in August with that in the previous month.
Researchers compared data on aircraft noise with hospital admissions and mortality rates among a population of 3.6 million people living near Heathrow airport.
They have also compared data from both the census and the sample with information gleaned from birth and death records supplied by states, estimates of illegal aliens produced by the Immigration and Naturalization Service and other demographic information.
Researchers from China and the United States compared data from studies in the two countries and found a direct relationship between how long people squatted in their 20's and their chances of developing knee arthritis.
We then compared data from 2000 (when the database was first established) with data from 2013.
Finally, we compared data from two points in time: 2000 and 2010.
The compared data is the energy added after five consecutive cycles.
We compared data from patients admitted to the ICU and those admitted to the ward.
