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File: Rcode-5-1.R

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urca 1.3-3-1
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library(urca)
data(Raotbl3)
attach(Raotbl3)
lc <- ts(lc, start=c(1966,4), end=c(1991,2), frequency=4)
lc.ct <- ur.df(lc, lags=3, type='trend')
plot(lc.ct)
lc.co <- ur.df(lc, lags=3, type='drift')
lc2 <- diff(lc)
lc2.ct <- ur.df(lc2, type='trend', lags=3)