ci: Confidence Interval for the Changepoint

In lm.br: Linear Model with Breakpoint

Confidence Interval for the Changepoint

Description

Confidence interval for 'theta', the changepoint's x-coordinate.

Usage

## S4 method for signature 'Cpp_Clmbr'
ci(  CL =0.95, method ="CLR", output ="T" )

Arguments

CL	confidence level, between 0 and 1.
method	"CLR" or "AF" which stand for conditional likelihood-ratio or approximate-F, see sl for details.
output	"T", "V" or "B" which stand for text, value or both.

Details

This subroutine scans to determine the postulate values of 'theta' that have significance level greater than 1-CL.

Value

'ci' prints-out the confidence interval for 'theta' but does not return a value if 'output' is "T". 'sl' returns a numeric vector of boudaries for the contiguous segments of the confidence interval if 'output' is "V" or "B".

Examples

#  Data for Patient B from Smith and Cook (1980)
y <- c(37.3, 47.1, 51.5, 67.6, 75.9, 73.3, 69.4, 61.5, 31.8, 19.4)
x <- 1:10
sc <- lm.br( y ~ x )
sc$ci()
sc $ ci( 0.90 )
sc $ ci( .99, 'af' )
sc $ ci( out= 'v' )

lm.br documentation built on Sept. 28, 2024, 1:07 a.m.