Re: [Gretl-users] Accumulating series in 12 months
On Sun, 7 Nov 2010, Henrique Andrade wrote:
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")?
series ppi12 = 100 * (ppiaco - ppiaco(-12))/ppiaco(-12)
Allin Cottrell