Description Usage Arguments Value Methods (by class) See Also Examples
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15  trendscatter(x, ...)
## Default S3 method:
trendscatter(x, y = NULL, f = 0.5, xlab = NULL, ylab = NULL, main = NULL, ...)
## S3 method for class 'formula'
trendscatter(
x,
f = 0.5,
data = NULL,
xlab = NULL,
ylab = NULL,
main = NULL,
...
)

x 
the coordinates of the points in the scatter plot. Alternatively, a formula. 
... 
Optional arguments 
y 
the y coordinates of the points in the plot, ignored if 
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. 
xlab 
a title for the x axis: see 
ylab 
a title for the y axis: see 
main 
a title for the plot: see 
data 
an optional data frame containing the variables in the model. 
Returns the plot.
default
: Trend and scatter plot
formula
: Trend and scatter plot
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17  # 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))

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