Teenage suicide in King County, Washington. I. Rates of suicide for 26 years

The population-adjusted rate of teenage suicide in King County, Washington, was reviewed for the 26 years from 1959 to 1984. For the entire period, the rate did not change significantly. An abrupt change did occur during the middle of this period, but, for reasons discussed in the text, this may well represent a change in procedures and philosophy of death certification rather than a real change in rate. Reasons for the apparent discrepancy with national statistics are discussed.     

Spatial variation of refractive index in a pane of float glass.

In the statistical interpretation of forensic glass evidence it is standard practice to make the assumption of homogeneity of the refractive index (RI) of the source glass, or of localized homogeneity. However, the work of Locke and Hayes showed that, for toughened windscreen glass, this assumption might not be true. This work is well cited, but there appears to have been little follow-on published research. Furthermore, the toughening process is something known to affect the refractive index, and is a process that float glass does not undergo. Float glass is a major component of casework in New Zealand and for that reason it would be interesting to know whether the findings of Locke and Hayes apply when dealing with float glass. In this paper we describe an experiment similar to that of Locke and Hayes, systematically examining the variation of RI in a pane of float window glass. It was found that, although there were no systematic differences in refractive index, there were observable differences across the pane.     

Liberal Equality, Exploitation, and the Case for an Unconditional Basic Income

This paper considers whether arguments presented in Philippe Van Parijs' Real Freedom for All: What (if Anything) Can Justify Capitalism? succeed in rebutting the objection that the introduction of a substantial unconditional basic income (UBI) would allow non-working citizens to free-ride on the efforts of, and so exploit, working citizens. It considers Van Parjis' 'external assets argument' for UBI, and finds that this argument does not succeed in reconciling payment of a substantial UBI with the reciprocity principle which underpins this 'exploitation objection'. It considers and rejects Van Parijs' implicit claim that the exploitation objection must be grounded in a distributive principle which contradicts the egalitarian commitment to prevent brute luck inequality. It concludes that Van Parjis has failed, thus far, to articulate a convincing response to the exploitation objection.     

A statistical approach to drug sampling: a case study.

In many countries it is left to the discretion of the court to accept or reject conclusions based on sampling procedures as applied to the total drug exhibit. As an alternative to this subjective approach, a statistical basis is presented using binomial and hypergeometric distributions to determine a lower limit for the proportion of units in a population which contains a drug, at a given confidence level. A method for calculating the total weight of a drug present in a population within a given confidence interval is also presented. In the event of no failures (all units sampled contain a drug), a sample size of six or seven units is generally sufficient to state that a proportion of at least 0.70 of the population contains a drug at a confidence level of at least 90%. When failures do occur in the sample, point estimation is used as the basis for selecting the appropriate sample size.