The development of high throughput screening (HTS) assays in the field of nanotoxicology provide new opportunities for the hazard assessment and ranking of engineered nanomaterials (ENM). It is often necessary to rank lists of materials based on multiple risk assessment parameters, often aggregated across several measures of toxicity and possibly spanning an array of experimental platforms. Bayesian models coupled with the optimization of loss functions have been shown to provide an effective framework for conducting inference on ranks. In this article we present various loss function based ranking approaches for comparing ENM within experiments and toxicity parameters. Additionally, we propose a framework for the aggregation of ranks across different sources of evidence while allowing for differential weighting of this evidence based on its reliability and importance in risk ranking. We apply these methods to high throughput toxicity data on 2 human cell lines, exposed to 8 different nanomaterials, and measured in relation to 4 cytotoxicity outcomes.
Patel, Trina; Telesca, Donatello; Rallo, Robert; George, Saji; Tian, Xia; and Andre, Nel, "Hierarchical Rank Aggregation with Applications to Nanotoxicology" (March 2012). COBRA Preprint Series. Working Paper 90.