First, we must narrow the range of statistical specifications which can be expected to yield valid predictions of teacher and school effects. (educationnext.org)
Predicted extinction times more than 100 years in the future are considered too uncertain and thus aren't considered as valid predictions of extinction, Koop says. (sciencedaily.com)
Climate science and climate models are nowhere near a developed state that permits valid predictions to be made. (climatescience.org.nz)