A critique of quasiexperimental and statistical controils for measuring program effects: Application to urban growth control

Most studies evaluating the effect on housing prices of regulatory programs for controlling urban growth use econometric methods (hedonic price models) without considering the research-design aspects of the task. The article examines the strengths and weaknesses of several quasiexperimental and statistical methods for measuring the effect of growth-control programs, using criteria extracted from theory. The methodological critique is tested empirically by comparing several methods using data from the growth-control community of Davis, California and from three comparison communities. The empirical test demonstrates that different research designs can produce, large differences in the magnitudes of estimated effects, and that adding statistical controls to quasiexperimental controls permits the detection of smaller effects.     

Death by obstruction: sudden death resulting from impromptu ingestion of drugs

Over an 18-month period, the department of Forensic Medicine and Science at the University of Glasgow investigated four rather unusual drug-related deaths. In all cases, death was due to the obstruction of the airway by a foreign body after an attempt to evade arrest. In all cases, the obstruction was drug packages of various shapes and sizes. Results of toxicology revealed levels of drugs that may have had a significant respiratory effect on the deceased in three of the cases. Rupturing of the packages and hence leakage of drugs being conducive to death was obvious in only one case.