Plot data in groups, each group with separate lowess smoothing
data in groups (shown by variable group) are plotted
lowess.bygroup(x, y, group, span=2/3, col=seq_along(x), lty=seq_along(x))
x, y |
coordinate vectors of equal length |
group |
grouping variable, must be a vector of same length as x and y |
span |
span of smooting |
col |
colour of lines |
lty |
line type |
The procedure is called for its side effect of producing a plot
Christian W. Hoffmann, christian@echoffmann.ch
par(mfrow=c(1,1))
gr <- c(rep(1,20),rep(2,30),rep(3,50))
x <- seq_along(gr); y <- jitter(0.01*(x-50)^2 + 1,1000)
plot(x,y,pch=".",cex=4,xlab="Lowess, with spans = 0.2 (r,g,mag), 0.4 (blue) ")
lowess.bygroup(x,y,gr,span=0.2,col=c("red","green","magenta"),lty=rep(2,3))
lowess.bygroup(x,y,gr,span=0.4,col="blue")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.