sasLM (version 0.10.5)

aov2: ANOVA with Type II SS

Description

ANOVA with Type II SS.

Usage

aov2(Formula, Data, BETA=FALSE, Resid=FALSE)

Value

The result table is comparable to that of SAS PROC ANOVA.

Df

degree of freedom

Sum Sq

sum of square for the set of contrasts

Mean Sq

mean square

F value

F value for the F distribution

Pr(>F)

proability of larger than F value

Next returns are optional.

Parameter

Parameter table with standard error, t value, p value. TRUE is 1, and FALSE is 0 in the Estimable column. This is returned only with BETA=TRUE option.

Fitted

Fitted value or y hat. This is returned only with Resid=TRUE option.

Residual

Weigthed residuals. This is returned only with Resid=TRUE option.

Arguments

Formula

a conventional formula for a linear model.

Data

a data.frame to be analyzed

BETA

if TRUE, coefficients (parameters) of REG will be returned. This is equivalent to SOLUTION option of SAS PROC GLM

Resid

if TRUE, fitted values (y hat) and residuals will be returned

Author

Kyun-Seop Bae [e-mail]

Details

It performs the core function of SAS PROC GLM, and returns Type II SS. This accepts continuous independent variables also.

Examples

  aov2(uptake ~ Plant + Type + Treatment + conc, CO2)
  aov2(uptake ~ Plant + Type + Treatment + conc, CO2, BETA=TRUE)
  aov2(uptake ~ Plant + Type + Treatment + conc, CO2, Resid=TRUE)
  aov2(uptake ~ Plant + Type + Treatment + conc, CO2, BETA=TRUE, Resid=TRUE)
  aov2(uptake ~ Type, CO2)
  aov2(uptake ~ Type - 1, CO2)