segmented (version 2.1-1)

draw.history: History for the breakpoint estimates

Description

Displays breakpoint iteration values for segmented fits.

Usage

draw.history(obj, term, ...)

Value

None.

Arguments

obj

a segmented fit returned by any "segmented" method.

term

a character to mean the `segmented' variable whose breakpoint values throughout iterations have to be displayed.

...

graphic parameters to be passed to matplot().

Author

Vito M.R. Muggeo

Details

For a given term in a segmented fit, draw.history() produces two plots. On the left panel it displays the different breakpoint values obtained during the estimating process, since the starting values up to the final ones, while on the right panel the objective values at different iterations. When bootstrap restarting is employed, draw.history() produces two plots, the values of objective function and the number of distinct solutions against the bootstrap replicates.

Examples

data(stagnant)
os<-segmented(lm(y~x,data=stagnant),seg.Z=~x,psi=-.8)
# draw.history(os) #diagnostics with boot restarting

os<-segmented(lm(y~x,data=stagnant),seg.Z=~x,psi=-.8, control=seg.control(n.boot=0))
# draw.history(os) #diagnostics without boot restarting