It's also worth chucking into the mix that the global average temperature variation between even the strongest El Nino event and the next ordinary year is a fraction of a degree Celsius - certainly less than the rise of about 0.6C that we've seen since the beginning of the study period, in 1950.
In 24, 000 couples, the HIV-infected partner had received treatment at the start of the study period - to test out the preventative benefits - while 14, 800 had not.
Because of the long follow-up period of the study, in which participants who were dementia-free developed the condition many years later, this is a less likely explanation, but was not ruled out in the research, Saczynski said.
Though the differences in shares of black players did decline throughout the period of study, they were still quite large in 1993.
Of course, rain-fed agriculture is even more vulnerable to climate change than the irrigated variety, as Ms Parcak's Cambridge colleague Lauren Ristvet showed the conference with her study of northern Syria during the same period as the fall of Egypt's Old Kingdom.
The study of a narrow period in depth is, of course, invaluable for developing important skills such as source analysis.
BBC: NEWS | UK | Education | How about some British history?
Over the 20-year period of the study, there was net outperformance of 9 percent per year between the longs and the shorts.
The museum housed in this fortified castle of the colonial period is dedicated to the study of navigation, underwater archaeology and maritime history.
The strengths of the Swedish study reviewed here include the large population based prospective cohort design along with the long period of follow up to validate the composition of the kidney stones.
For starters, the participants' sodium consumption was gauged by measuring the sodium content of their urine over just one 24-hour period at the beginning of the study.
They found that during the period of study, eight of them ventured out into the open ocean.
And the proportion of older, heavier donors increased during the study period.
Senator Jon Tester, Democrat of Montana, recently introduced a bill calling for a two-year delay of interchange fee regulation, and a one-year study in that period of the effect of the proposed limits.
They found N-BNP levels were on average three times higher in patients who died during the period of the study than in those who survived.
They also found that the number of livers donated after so-called cardiac deaths rose during the study period, and that those livers were more likely not to be used.
Another issue is that unlike some clinical trials, the study does not end after a fixed period of time.
In 2003 mutual fund tracking firm Morningstar conducted a study that broke the 20-year period of 1976-2002 into five four-year segments.
Over that same period of study, the difference between the best- and worst-performing sector was over 200%, so the year-to-year difference between sector performances is magnified over longer time frames.
FORBES: Sector Investing Much Smarter Than Trying To Guess What's Growth And Value
They said that during the study period, adding an extra portion of unprocessed red meat to someone's daily diet would increase the risk of death by 13%, of fatal cardiovascular disease by 18% and of cancer mortality by 10%.
BBC: Red meat increases death, cancer and heart risk, says study
To get around this potential problem, the University of Pennsylvania study only examined studies without a washout period.
The New England Journal study, involving 1, 400 adults over a 2.5 year period showed that the rate of heart attack 1 month after a negative coronary CT was less than 1 percent, showing that it is a safe test for patient discharge from the ER.
Some who study the calendar say the date for the end of the period is not Friday, but Sunday.
For his test, the study used the three-year period from November 1 of the year after the previous election through October 31 of election year based on the logic that society tends to judge a President by change during the bulk of the presidential term, while assigning credit or blame for the start of the first year to his predecessor.
Some who study the Mayan calendar say the date for the end of the period is not Friday, but Sunday.
In forecasts extending beyond the sample period used in the study, a stern test of any model, Mr Oswald's approach easily outperforms its rivals, including consensus predictions of commercial forecasters.
Pope Benedict has since called for a "period of deeper study and reflection" on the beatification process - widely seen as putting the process on hold.
"Consider the consequences of continuing to subject young people to an education system rooted in the Victorian era as a preparation for a post-school period of study and work in a digital age, " she said.
As our study indicates, each recession in the past 42 years was preceded by a period of negative growth in real gross total debt.
After a period of study and early work in Brussels, Ensor at the age of 20 retreated to the quiet seaside town of Ostend.
The parameters of this study would suggest a sudden interest in QQQ-related equities following a period in which hedged players were ignoring this group.
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