[R] "ccf versus acf"

From: Werner,Arelia [PYR] <Arelia.Werner_at_ec.gc.ca>
Date: Fri 15 Sep 2006 - 00:10:26 GMT


I am trying to run a cross-correlation using the "ccf()" function. When I select plot = TRUE in the ccf() I get a graph which has ACF on the y-axis, which would suggest that these y-values are the auto-correlation values.

How should I adjust the code to produce a plot that provides the cross-correlation values?

Here is my code:

w002dat <- read.csv("w054_1128958_08NM174.csv", header=TRUE) w002dat$date <- as.Date(w002dat$date,"%m/%d/%Y") attach(w002dat)
w002ccfhdgw <- ccf((gwneg), (hydro), lag.max = 400, type = c("correlation"),

         plot = TRUE, na.action = na.exclude)

Thank you

Arelia

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