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Table 4 Fixed effects instrumental variables estimates with interaction variables – the influence of working time accounts on profits

From: Working time accounts and firm performance in Germany

  (1) (2) (3)
  β std. err β std. err. β std. err
WTA −3.358*** 0.950 −3.489*** 1.019 −3.860*** 1.174
WTA*EXPORT_d 1.068*** 0.309     
WTA*FSIZE_l    1.609*** 0.455   
WTA*Y2009      1.454*** 0.417
  1. Notes: The control variables are the same as in Table 3. EXPORT_d (=1 if the firm exports), FSIZE_l (=1 if the firm is large, i.e. 500 or more employees) and Y2009 (=1 if the year is 2009) are dummies; ***p < 0.01