conf.functions: Conf Int Functions
In seeg: Statistics for Environmental Sciences, Engineering, and Geography

Description Usage Arguments Details Value Note Author(s) References See Also Examples

Functions to obtain confidence interval for a regression.

1	conf.int.lm(dat.lm, alpha)

`dat.lm`	data frame used for regression
`alpha`	alpha or error type I

Calculates and plots the confidence intervals for a regression (Follows MathSoft 1999, pages 7-26 to 7-29).

`lower`	lower value of confidence interval
`upper`	upper value of confidence interval

Input files are in 'datafiles.zip' in directory 'datafiles' and organized by chapters of Acevedo (2013). The example below requires an input file.

Miguel F. Acevedo Acevedo@unt.edu

Acevedo M.F. 2013. "Data Analysis and Statistics for Geography, Environmental Science, and Engineering", CRC Press. MathSoft, 1999. S-PLUS 2000 Guide to Statistics Volume 1 and Volume 2.

linear regression lm, plots plot

## Not run: 
light.depth <- read.table(file="lab6/light-depth.csv",sep=",",header=TRUE)
attach(light.depth)
light.lm <- lm(Light ~ Depth) 
par(mfrow=c(2,1))
plot(Depth, Light)    
abline(light.lm$coef)
conf.int.lm(light.lm, 0.05)

## End(Not run)