anovasat {GRRGI}R Documentation

ANOVA Estimates of Variance and Satterthwaite Confidence Limits for Gauge R and R Data

Description

Returns a matrix of the ANOVA Estimates of Variance for gauge R and R studies. Also provides the confidence intervals for repeatability, reproducibility and total gauge using the Satterthwaite approximation as shown on page 244 of Hamada and Weerandi.

Usage

anovasat(data, prob)

Arguments

data Gauge R and R data, a matrix with columns named 'resp', 'part' and 'operator' in any order
prob desired confidence limits such as 0.95 - a constant between 0 and 1

Details

Returns a matrix with 17 rows and three columns with the estimates: The standard deviations: 'SD:Part', 'SD:Operator', 'SD:PartOp', 'SD:Repeat', 'SD:Reproduce', 'SD:Gauge', 'SD:Total' The Variances: 'Var:Part', 'Var:Operator', 'Var:PartOp', 'Var:Repeat', 'Var:Reproduce', 'Var:Gauge', 'Var:Total' The ratios: 'Gauge/Total', 'Gauge/Parts', 'Repeat/Gauge' The columns are 'ANOVA est', 'Lower STH', 'Upper STH'. The 'Lower STH' and 'Upper STH' are the Satterthwaite based confidence limits. They are calculated for repeatability, reproducibility and total gauge. 'anovasat' will eliminate the 'part*operator' interaction factor if its P value is greater than 0.25.

Value

A matrix with 17 rows and three columns with the estimates.

Note

The 'data' argument needs to be a matrix with columns named 'resp', 'part' and 'operator'.

Author(s)

Walter Resch walt55128@msn.com

References

Package is based on Michael Hamada and Sam Weerandi (July 2000) Measurement System Assessment Via Generalized Inference, Journal of Quality Technology 32, 241-253

See Also

MLGI, RRgraph, ratiograph

Examples

data(HWstudy1)
anovasat(HWstudy1,0.95)

[Package GRRGI version 1.0 Index]