Statistical Control Charts: A Technique for Analyzing Industrial Hygiene Data

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Abstract
Industrial hygienists are often confronted with decisions regarding the acceptability of monitoring or other types of data. Professional judgment is used most often to make these evaluations, but some industrial hygienists are now beginning to apply more rigorous, quantitative methods such as statistical data analysis. In cases where monitoring data have been collected sequentially with a structured sampling plan, the statistical control chart may be a suitable method for evaluating results. Control charts facilitate the evaluation of time trends in data and allow the industrial hygienist to identify changes in the levels over time and in the variability of data gathered in monitoring campaigns. While a useful tool in some situations, control charting has some limitations as applied to industrial hygiene data. These limitations are discussed.

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