summary method for class
an object of class
further arguments from other methods - will be ignored in the summary
Van Westendorp, P (1976) "NSS-Price Sensitivity Meter (PSM) – A new approach to study consumer perception of price" Proceedings of the 29th ESOMAR Congress, 139–167. Online available at https://www.researchworld.com/a-new-approach-to-study-consumer-perception-of-price/.
Newton, D, Miller, J, Smith, P, (1993) "A market acceptance extension to traditional price sensitivity measurement" Proceedings of the American Marketing Association Advanced Research Techniques Forum.
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