It is known that Dickey-Fuller tests can lead to spurious rejections of the unit root nullhypothesis when the true generating process is difference-stationary with a break.Suppose now that an unsuccessful attempt is made to allow for a break, either throughmisplaced dummy variables or through...

We present a new approach to estimating health gains from treatments by asking respondentsto directly compare the ‘before’ and ‘after’ treatment health states in the time trade-off (TTO)framework. We found that responses to these direct comparisons were much more likely tocapture a...