Dear Gretl Community,<br><br>I have 2 time-series, X and Y, and I need to create a new one, Z, that is defined as:<br><br>Z(1) = X(1)<br>Z(2) = Z(1) + Y(2)<br>Z(3) = Z(2) + Y(3)<br>.<br>.<br>.<br>Z(n) = Z(n-1) + Y(n)<br><br>

Where Z(1) is the first observation of the series Z, Z(2) is the second observation of the series Z, and so on.<br><br>How can I do this with Gretl?<br><br>Best,<br>-- <br>Henrique C. de Andrade<br>Doutorando em Economia Aplicada<br>

Universidade Federal do Rio Grande do Sul<br><a href="http://www.ufrgs.br/ppge" target="_blank">www.ufrgs.br/ppge</a><br>