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The behavior of the value of productive assets can be analyzed from different perspectives. Currently, an analysis of the influence of the age of an asset on its asking price through access to a mass information volume, as well as the emergence of new technologies that allow complex computations to be carried out. The core of this work focuses on the analysis of the value of public works machinery and construction because this group of assets belong to companies in a sector that suffered a very negative decline in the evolution of their profits (because of the economic crisis started in 2007). Applying linear, exponential and potential regression models, the behavior of the asking price of assets based on their age is analyzed. Previously the database is processed in order to eliminate the outlier data using the technique of Median Absolute Deviation. Therefore, a basic depreciation rate (based solely on the passage of time) is presented, which is contrasted by the application of cross-validation techniques.

Case study: Model for economic lifetime of public construction machinery with ordinary least squares regression and cross validation techniques