sasLM (version 0.5.0)

PDIFF: Pairwise Difference by Least Significant Difference

Description

Estimates pairwise difference by least signicicant difference.

Usage

PDIFF(Formula, Data, Term, conf.level=0.95)

Arguments

Formula

a conventional formula for a linear model

Data

a data.frame to be analyzed

Term

a factor name to be estimated

conf.level

confidence level of confidence interval

Value

Returns a table of expectations, t values and p-values.

Estimate

point estimate of the input linear constrast

Lower CL

lower confidence limit

Upper CL

upper confidence limit

Std. Error

standard error of the point estimate

t value

value for t distribution

Df

degree of freedom

Pr(>|t|

probability of larger than absolute t value from t distribution with residual's degree of freedom

Details

This usually shows the shortest interval. It corresponds to SAS PROC GLM PDIFF. Interaction of three variables is not supported yet.

Examples

# NOT RUN {
PDIFF(uptake ~ Type*Treatment + as.factor(conc), CO2, "as.factor(conc)")
# }