A college's yield rate is the percentage of accepted students who choose to attend the school. In part because it used to be a factor in college rankings, Admissions officers employ all kinds of techniques to raise it. These include Early Decision, the Scholars program, Days on Campus, and use of the alumni network.
Columbia's yield rate has been on the rise, and the school touts it as a reflection of the desirability of the school, even though it still lags behind other peer institutions.
According to the university's 2007 Facts pamphlet, the yield rate for undergraduate admissions has been: