Identifying time series
On Mon, 4 Oct 2004 09:00:46 -0400 John DeAngelis wrote:
Hello, I am currently attempting to introduce R at my company and am trying to import time series data from a text file into R to graph. The format of the text file is in date, data (e.g., 20040929 3.361).
You can read in such a file, e.g., via
R> x <- read.table(file = "mydata.txt", colClasses = c("character",
"numeric"))
My problem is that I do not know how to get R to recognize the first column as a business date series.
You can do that via strptime(), e.g., R> strptime(x[,1], "%Y%m%d") (and possibly convert then to POSIXct or Date). Then you can create an irregular time series, e.g. via package its or via package zoo: R> y <- zoo(x[,2], strptime(x[,1], "%Y%m%d")) R> plot(y) hth, Z
Or at the very least, I am unable to find a function that will grap the second column (y-axis) against the date series (x-axis). If you could tell me how to graph this type of data, I would greatly appreciate it. Thank you. Regards, John DeAngelis
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