Six Sigma and Beyond: Statistical Process Control, Volume IV

R

Randomness, 439

R and Xbar chart

advantages and disadvantages of, 133

causes that affect, 216, 218 “220

construction of, 133 “145

control limits, 134 “135

illustration of, 237

moving range chart vs., 145 “146

nominal, 278 “279

process control, 136 “137

sampling frequency and size , 133 “134

short-run, 281 “282, 293

short-run statistical process control, 278 “279

target, 280 “281

vertical scale, 136

Range, 68 “69, 337

Rational samples, 118 “119

Rational subsamples, 119

Red bead experiment, 111 “113

Regression analysis, 46

Regression tests

Shapiro-Wilk W test

for exponentiality, 83 “85

for normality, 83

underlying distribution detection using, 82 “83

Reliability and maintainability

description of, 34 “35

problem solving using, 34 “35

Repeatability errors

definition of, 323 “324

spread caused by, 339

standard deviation calculations, 351, 354

tolerance caused by, 339 “340

variation caused by, 338, 352

Reproducibility errors

description of, 323 “325

spread caused by, 339

tolerance caused by, 340

variation caused by, 338 “339

Risk reduction, 33

Robust, 6

Runs

statistical analysis of, 225 “227

test of, 221 “222