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2011 Jan 27
1
normalizing prizes to a specific year - how to?
...the prices to, eg. 2010 prices.
The data frame looks like this
> head(dafP)
Y P
1 2004 11199.60
2 2005 15310.10
3 2005 19491.50
4 2005 18656.70
5 2005 16092.00
6 2005 9929.08
Y is Year and P is price (in Danish Kroner) per m2
I looked in some old scripts and have written this:
dafP$Yav <- ave(dafP$P,dafP$Y,FUN=mean) # Yav. Prices Weight per Year,
i.e. Yearly mean
dafP$Pno <- dafP$P * (mean(dafP$P)/dafP$Yav) # Prize Normalized by Year
Can any one comment on this:
*
This code only normalizes so all year get the same mean. How would
I go about 'normali...