On Sun, 7 Nov 2010, Henrique Andrade wrote:
Em 17 de novembro de 2010 Allin Cottrell <cottrell(a)wfu.edu>
escreveu:
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)
>
Definitely this is much simpler :-)
But if we don't have the price index (like the PPI)? That is, if
we have only the monthly inflation (like the variable "x" in my
script)?
Is this a trick question ;-) What sort of data source gives you
month-on-month inflation and no price index? If there is such a
source, complain!
Allin