Never leave a child unobserved around water, including bathtubs and 5-gallon buckets.
Since rape is likely to be an unobserved crime, victims may not have corroborative evidence.
Many beautiful and moonless nights have passed unobserved because I was too exhausted to carry a hundred pounds of equipment into the backyard.
The longer the panel, the more likely it is to include unobserved effects that may affect pollution.
Large-scale jet instability is likely t o be the underlying cause of the snaking which may well be a yet unobserved feature of air.
Moreover, discrepancies between expectations and observations may force him to conclude that some exogenous actions in the past remained unobserved.
This approach should yield more precise standard errors when controlling for unobserved patient heterogeneity.
