Measuring Crop Yields
Crop yield or the quantity of crop output harvested (say in tonnes) per unit of area cultivated (say in hectares) is the most important measure of agricultural performance worldwide.
The Significance of Cohort Studies in Social Science
The Life Project, a new book by Helen Pearson, describes the rich history of cohort studies in the United Kingdom.* These are longitudinal studies of individual lives starting from the time of birth and continuing over an extended period.