[R] Fwd: time series patterns

From: Raphael Fraser <raphael.fraser_at_gmail.com>
Date: Sat 01 Jul 2006 - 08:00:00 EST

Hi all.

I have a factor variable distributed over time. I am looking for an elegant way to code duration of a state. Suppose,

>rainfall.shocks <- factor(sample(c(1,2,3), size = 15, replace = TRUE, prob
>= unit.p),

+                  label = c("Drought", "Normal", "High"))

>
>rainfall.shocks

[1] Normal High High Drought Normal Normal High Normal Drought [10] Normal Drought Normal Normal Normal Normal

So capture the duration of say drought, I'd need a variable that is able to keep track of rainfall.shocks as well as its past values. I was wondering if there is any obvious way to do this. the Drought variable in this case would have values

0 0 0 1 0 0 0 0 1 0 1 0 0 0 0

many thanks for the suggestions you are likely to make.

Alexander Nervedi



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