I was playing with gretl gui when i got an &quot;undefined error&quot; on arch (and some other model too) with this serie of lags :<br>1 2 3 4 5 6 7 8 28 37 41 42 50 52 58 72 87 97 129 <br>with the data i joined with this mail.<br>

I think it&#39;s a bug.<br><br>thanks.<br><br><br>