Correction to: Scientific Reports https://doi.org/10.1038/s41598-017-00198-5, published online 13 March 2017

This Article contains an error in the Methods section under subheading ‘Data analysis’.

“ln(E[λ ij |X ij ]) = ln(worker ij ) + β0 + b0i + β1 new criteria i  + β2 working hour ij  + β3 salary ij  + β4 unemployment rate ij  + β5 year i

should read:

“ln(E[Y ij |X ij ]) = ln(worker ij ) + β0 + b 0i  + β1 new criteria i  + β2 working hour ij  + β3 salary ij  + β4 unemployment rate ij  + β5 year i