Abstract
In modern chemical process systems huge amount of data are recorded. These data definitely have the potential to provide information for product and process design, monitoring and control. This paper presents a brief survey of simple Exploratory Data Analysis procedures have been found to be useful in the qualitative analysis of historical process data. The presented Box plots and quantile-quantile plots are applied to an industrial polyethylene plant to analyse different productions of a given product and to explore the relationships between different operating and product quality variables.
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