As I mentioned before is one example on the risk for breast cancer in women, so you'd randomly assign half to following their usual diet, the other half to an intervention program where people are prescribed a low fact diet, given counseling and interventions from dieticians and things, and then you look to see what happens for risk as people go forward in time.

我之前提过,这例子研究的是,女性的乳腺癌发病率,你将随机选择其中一半人按一般习惯饮食,另一半人则参与一个干预计划,其中每人都要食用,由营养学家设计推荐的低脂肪菜单,然后再看随着时间推移,被试者的发病率是怎样变化的

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

There is an apparent contradiction between most economists' support for free trade, low taxes and less intervention in the market and the low marks many give to Mr McCain, who is generally more supportive of those things than Mr Obama.

ECONOMIST: The Economist's poll of economists

Add these costs to the human toll of people being turfed out of their homes, and it is no surprise that America's politicians are scrambling for ways to stem the foreclosures. (All the more so because hardest-hit areas include election swing states such as Ohio and Florida.) So far, the focus is on low-cost intervention: encouraging borrowers to seek counselling and lenders to show forbearance.

ECONOMIST: America's property crisis

Homeowners who have suffered for five years as they watched the value of their homes, the consummate investment, drop lower and lower would rather not forgo government intervention to see just how low prices will go.

FORBES: Republicans Offer Unpopular Solutions for Housing Fix