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5 and 1. 1 Conditionals Binary Operators Conditionals, like the rest of R, are highly vectorized. The comparison > x < 3 returns a vector of TRUE/FALSE values, if x is a vector. This vector can then be used in computations. For example. We could set all x values that are less that 3 to zero with one command > x[x<3] <- 0 The conditional within the brackets evaluates to a TRUE/FALSE vector. Wherever the value is TRUE, the assignment is made. Of course, the same computation could be done using a for loop and the if command.

Max. union(Y1,Y2,Y3) > var6 <- ar(y,aic=FALSE,order=6) Unfortunately, the ar() approach does not have built in functionality for such things as predictions and impulse response functions. The reader may have to code those up by hand if necessary. Alternately, the ARMA() function in the dse1 library can fit multivariate time series regression in great generality, but the programming overhead is correspondingly great. There is also a vector autoregression package on CRAN named VAR, but I have not used it.

Plot(x,y,type="l", main="X and Y example",ylab="y values",xlab="x values") plots a line in the x-y plane, for example. Colors, symbols, and many other options can be passed to plot(). For more detailed information, see the help system entries for plot() and par(). After a plotting window is open, if we wish to superimpose another plot on top of what we already have, we use the lines() command or the points() command, which draw connected lines and scatter plots, respectively. Many of the same options that apply to plot() apply to lines() and a host of other graphical functions.

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