Dear Gretl Community,<div><br></div><div>I would like to calculate the PPI inflation of the last 12 months. For this</div><div>task I&#39;m using the following sript:</div><div><br></div><div><i>&lt;script&gt;</i></div><div>

<b><font class="Apple-style-span" color="#990000">open</font></b> fedstl.bin</div><div><div><b><font class="Apple-style-span" color="#990000">data</font></b> ppiaco</div><div><b><font class="Apple-style-span" color="#009900">series</font></b> x = ppiaco/ppiaco(-1)</div>

<div><b><font class="Apple-style-span" color="#009900">series</font></b> ppi_12_months = ((x(-11) * x(-10) * x(-9) * x(-8) * x(-7) * x(-6) * x(-5) * x(-4) * x(-3) * x(-2) * x(-1) * x) - 1) * 100</div><div><b><font class="Apple-style-span" color="#990000">delete</font></b> x</div>

<div><b><font class="Apple-style-span" color="#990000">setinfo</font></b> ppi_12_months -d <font class="Apple-style-span" color="#CC33CC">&quot;PPI accumulated in the last 12 months&quot;</font></div></div><div><i>&lt;/script&gt;</i></div>

<div><br></div><div>How can I make it more &quot;elegant&quot; (i.e &quot;shorter&quot;)?</div><div><br></div><div>Best regards, </div><div>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>
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