trendscatter {s20x} | R Documentation |
Plots a scatter plot for the variables x, y along with a lowess smooth for the underlying trend. One standard deviation error bounds for the scatter about this trend are also plotted.
trendscatter(x, ...) ## Default S3 method: trendscatter (x, y = NULL, f = 0.5, xlab = NULL, ylab = NULL, ...) ## S3 method for class 'formula': trendscatter (x, f = 0.5, data, xlab = NULL, ylab = NULL, ...)
x |
the coordinates of the points in the scatter plot. Alternatively, a function. |
y |
the y coordinates of the points in the plot, ignored if 'x' is a function. |
f |
the smoother span. This gives the proportion of points in the plot which influence the smooth at each value. Larger values give more smoothness. |
data |
an optional data frame containing the variables in the model. |
xlab |
a title for the x axis: see title . |
ylab |
a title for the y axis: see
title . |
... |
Optional arguments |
Returns the plot.
"residPlot"
# A simple polynomial x<-rnorm(100) e<-rnorm(100) y<-2+3*x-2*x^2+4*x^3+e trendscatter(y~x) # An exponential growth curve e<-rnorm(100,0,0.1) y<-exp(5+3*x+e) trendscatter(log(y)~x) # Peruvian Indians data data(peru.df) trendscatter(BP~weight, data=peru.df) # Note: this usage is deprecated with(peru.df,trendscatter(weight,BP))