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Table 2 Panel data structure

From: The impact of contactless payment on cash usage at an early stage of diffusion

 20092010201120122013
Nr. of respondents21732102215120652089
2009–2010 panelists19131913   
2010–2011 panelists 18011801  
2011–2012 panelists  19261926 
2012–2013 panelists   13301330
2009–2012 panelists1515151515151515 
2009–2013 panelists11321132113211321132
  1. Source: Schuh and Stavins (2014) and Angrisani et al. (2015)