Alphabetical List of Features

U

U control chart for attributes—quality control, Control Chart
uncertainty—measured as total loglikelihood
Uniform—method of generating a space filling design (DOE), Space Filling Design
uniform precision—DOE, Response Surface Design
uniformly weighted moving average chart—UWMA Control Charts
univariate repeated measures—with sphericity test and degree of freedom adjustments (Greenhouse-Geisser and Huynh-Feldt), Fit Model Manova

V Mask—see cumulative sum plot, Control Chart
Van der Waerden test— nonparametric test that k samples have equal means, Fit Y by X oneway
variability analysis—variance component estimates, Gage R&R reports and plots, Variability/Gage Chart
variance component estimates—random effects model specify one or more effects as random (see also mixed models), handles unbalanced designs, Fit Model SLS
variance homogeneity—tests that the group variances are the same in a one-way ANOVA (see also Welch ANOVA, and O’Brien’s, Brown-Forsythe’s, Levene’s, and Bartlett’s test of homogeneity), Fit Y by X oneway
varimax rotation—rotated components, Spinning Plot
variogram—diagnostic for time series modeling, Modeling > Time Series

Wald Chi-square test—logistic regression, Fit Y by X logistic
Weibull analysis—nonlinear regression with appropriate loss function, (see also loss function templates) Modeling > Nonlinear
Weibull fitting—fits a Weibull 2- or 3- parameter Weibull distribution to data, Distribution
Weibull survival curve—Survival and Reliability > Fit Parametric Survival
Welch ANOVA— one-way ANOVA when there is non-homogeneity of variance, Fit Y by X oneway
Western Electric Rules (tests for special causes)—quality control, Control Chart
Westgard rules (tests for special causes)—quality control, Control Chart
white noise tests—tests whether a time series is white noise, the Fisher-Kappa and BKS statistics are calculated for spectral density plots, Multivariate > Time Series
Wilcoxon rank sum—two sample rank test equivalent to Mann-Whitney (see also Kruskal-Wallis for k samples), Fit Y by X oneway
Wilcoxon signed-rank nonparametric test of mean, in matched pairs, tests the difference between two columns is zero, Distribution and Matched Pairs
Wilcoxon test—survival analysis, Survival and Reliability > Survival/Reliability
Wilk’s lambda—approximate F test for multivariate analysis of variance Fit Model Multivariate
Winters method time series forecasting—(see time series modeling)

z test—compare single Mean to a value, Distribution
zone lines—zones for control charts, used with tests for special causes (see Western Electric Rules)
zooming—use the magnifier glass tool to zoom in or out on any subset of a plot