[Gretl-users] Accumulating series in 12 months

Dear Gretl Community, I would like to calculate the PPI inflation of the last 12 months. For this task I'm using the following sript: *<script>* *open* fedstl.bin *data* ppiaco *series* x = ppiaco/ppiaco(-1) *series* 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 *delete* x *setinfo* ppi_12_months -d "PPI accumulated in the last 12 months" *</script>* How can I make it more "elegant" (i.e "shorter")? Best regards, Henrique C. de Andrade Doutorando em Economia Aplicada Universidade Federal do Rio Grande do Sul www.ufrgs.br/ppge