regression {RandomFields}R Documentation

Regression plot

Description

Interactive regression plot

Usage

regression(x, y, main, scr, value=function(regr) regr$coeff[2], 
           variable="var", mode=c("nographics", "plot", "interactive"),
           regr.select=c("coefficients"), averaging=FALSE, cex.main=0.85,
           col.passive = "grey", col.active = "green",
           col.main.passive = "black", col.main.active = "red",
           col.points.chosen = "lightblue", col.abline = "yellow",
           col.abline.chosen = "darkblue", col.smooth = "red", ...)

Arguments

x x-coordinates of the regression plot
y y-coordinates
main main title
scr split.screen must have been called beforehand; scr gives the screen number
value function; the characteristic of interest is a function of the regression output.
variable name of the characteristic of interest, plotted in the graphs
mode A scalar character of one of the following values 'silent', 'plot', or 'interactive':
'silent':
no output except the return of the result
'plot':
the regression line is plotted
'interactive':
the regression domain can be chosen interactively
Any mode includes all the functionalities of the modes that precede in the above enumeration. In the interactive mode, the regression domain is chosen by two mouse clicks with the left mouse; a right mouse click leaves the plot.
regr.select vector of characters that select elements from the lm return list; these elements are returned by regression.
averaging logical. If TRUE and y is matrix then the values of y are averaged row-wise beforehand
cex.main font size of the title
col.passive colour of the data points if plot is not active
col.active colour of the data points if plot is active
col.main.passive colour of the title if plot is not active
col.main.active colour of the title if plot is active
col.points.chosen colour of the selected points
col.abline colour of the regression line for all points
col.abline.chosen colour of the regression line for the selected points
col.smooth colour for the smoothed data
... further graphical parameters

Value

The function returns a list with the following components

regr part of the return list of lm
val the calculated value of the variable of interest
regr.u NULL or part of the return list of lm for x.u and y.u
val.u NULL or the calculated value of the variable of interest for the restricted domain
x.u NULL or the restricted x-coordinates given by the user in the interactive plot
y.u NULL or y-coordinates according to x.u
sm smoothed curve through the (x,y) points

Author(s)

Martin Schlather, martin.schlather@math.uni-goettingen.de http://www.stochastik.math.uni-goettingen.de/institute

[Package RandomFields version 1.3.41 Index]