However, since the percentage of entrants drops consistently starting from the fourth year and shows a decreasing trend year after year, I chose to consider a three-year window for Period 1, in order to have a sufficient number of individuals that were employed in Period 1 but, at the same time, to have a enough time over which the variable is observed in Period 2.
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The sentences
The coefficient for the early duration of non-employment is quite stable in all the considered specifications and in the most complete one it is statistically highly significant and equal to 0.45.