Duration analysis of firms – cohort tables and hazard function

The aim of this study is to identify the survival process of a cohort of firms. I propose my original systematic approach to the methods for analysing the firms’ vitality (statistical and econometric study on the cohorts of firms). I obtained the research data from 59587 economic entities established in the Zachodniopomorskie voivodeship (Poland) in 2009-2011. As a result I found out that the intensity function of firms’ liquidation take a typical inverted U-shape.