Hello Tomas! There are functions for pacf and plot.acf. They are in library(ts) Hope this helps! Sincerely, Erin Hodgess Associate Professor Department of Computer and Mathematical Sciences University of Houston - Downtown mailto: hodgess at gator.uhd.edu To: R-help at stat.math.ethz.ch Date: Sat, 28 Feb 2004 19:52:33 +0100 Subject: [R] Stepwise regression and partial correlation for wildlife census time series Dear List; We are doing a time series analysis of wildlife census data. We use a stepwise regression of the annual per capita rate of increase against pervious years population size (log transformed) as suggested by Berryman & Turchin (2001, Oikos 92:265-270). How can we obtain the partial correlation coefficients in R to make a plot of them against the lag as in a standard PACF? Yours Sincerely Tomas Willebrand