Measurement of the concentration of small asbestos fibers is important in studies of environmental health issues and in setting and enforcing appropriate regulations. The concentrations of such fibers are measured most accurately by an electron microscope, but for practical reasons, optical microscopes must sometimes be used. Kiefer et al. (1987) compared measurements of asbestos fiber concentration from 30 airborne samples by a scanning electron microscope (SEM) and by a phase contrast microscope (PCM). The data are contained in the file asbestos. Study the relationship between the two measurements, taking the more accurate SEM measurements as the independent variable and the PCM measurements as the dependent variable.
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