plotlag: plotlag plots the effect of a lag between two variables

In haddonm/rforcpue: Functions to Assist With The Analysis of CPUE Data

plotlag plots the effect of a lag between two variables

Description

the use of the function ccf can suggest a lagged relationship between a driver variable and a react(ing) variable. For example, cpue may respond to catches in a negative manner after a lag of a few years. One looks for a negative lag, which would imply that the driver variable influences the react(ing) variable after the given lag has passed. The lag is always assumed to be based on yearly intervals, though this can be changed.

Usage

plotlag(
  x,
  driver = "catch",
  react = "cpue",
  lag = 0,
  interval = "year",
  filename = "",
  resol = 200,
  fnt = 7,
  label = ""
)

Arguments

x	the matrix containing columns of the named variables. It must contain columns with the same names as the driver and react(ing) variables
driver	the variable doing the influencing
react	the variable being influenced
lag	the time lag before the influence is felt
interval	the name of the time-interval variable, default='year'
filename	default is empty. If a filename is put here a .png file with that name will be put into the working directory.
resol	the resolution of the png file, defaults to 200 dpi
fnt	the font used in the plot and axes. Default=7, bold Times. Using 6 gives Times, 1 will give SansSerif, 2 = bold Sans
label	a name for the plot, perhaps the sau or black name to identify the data source.

Value

a list containing some summary results, the anova of the linear model fitted in aov, and a summary of the linear model in summ

Examples

## Not run: 
year <- 1985:2008
catch <- c(1018,742,868,715,585,532,566,611,548,499,479,428,657,481,645,961,
           940,912,955,935,940,952,1030,985)
cpue <- c(0.6008,0.6583,0.6791,0.6889,0.7134,0.7221,0.7602,0.7931,0.8582,
          0.8876,1.0126,1.1533,1.2326,1.2764,1.3307,1.3538,1.2648,1.2510,
          1.2069,1.1552,1.1238,1.1281,1.1113,1.0377)
dat <- cbind(year,catch,cpue)
out <- plotlag(dat,driver="catch",react="cpue",lag=7)
round(out$results,5)
out$summ

## End(Not run)

haddonm/rforcpue documentation built on Oct. 12, 2024, 11:55 p.m.