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library(ggfortify) autoplot(acf(gold[,2], plot = FALSE)) ggtsdiag(auto.arima(gold[,2]))
gold <- as.xts(gold[, 2], order.by = gold[, 1])
gdp <- ts((0.001 * (gdp[, 2])), frequency = 4, start = c(1992, 1)) plot(gdp)
monthplot(gdp, xlab="", ylab="")
seasonplot(gdp, s = 4, year.labels = T, col = rainbow(12))
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