Providing software solutions since 1976
Features
Analysis of Variance
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ANOVA for balanced data
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general linear models
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unbalanced data
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analysis of covariance, response-surface models, weighted regression, polynomial regression, MANOVA, repeated measurements analysis
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least squares means
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random effects
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estimate linear functions of the parameters
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test linear functions of the parameters
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multiple comparison of means
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homogeneity of variance testing
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mixed linear models
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fixed and random effects
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REML, maximum likelihood, and MIVQUE0 estimation methods
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least-squares means and differences
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sampling-based Bayesian analysis
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many covariance structures, some of which are compound symmetry, unstructured, AR(1), Toeplitz, heterogeneous AR(1), and Huynh-Feldt
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multiple comparison of least-squares means
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repeated measurements analysis
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nonlinear mixed models
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variance components
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nested models
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lattice designs
Regression Analysis
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ridge regression
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linear regression
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nine model-selection techniques including backwards, forwards, stepwise, and those based on R-squared
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diagnostics
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hypothesis tests
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partial regression leverage plots
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outputs predicted values and residuals
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graphics device plots
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response surface regression
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nonlinear regression
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derivative-free
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steepest-descent, Newton, modified Gauss-Newton, Marquardt and DUD methods
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linear models with optimal nonlinear transformation
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partial least squares
Categorical Data Analysis
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weighted least squares analysis
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loglinear models
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generalized estimating equations
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Mantel-Haenszel Methods
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Fisher's exact test
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r x c exact tests
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probit analysis
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logistic regression
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various model-selection methods
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proportional odds model for ordinal response
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regression diagnostics
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conditional logistic model
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roc curves
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discrete choice models
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multinomial logit models
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generalized linear model
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probability distributions include normal, binomial, Poisson, negative binomial, gamma, and inverse Gaussian
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link functions include logit, probit, identity, complementary log-log, log, and power with lamda=value
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profile likelihood-based confidence intervals
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likelihood ratio statistics for contrasts
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user-defined link functions and probability distributions
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Multivariate Analysis
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principal components
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canonical correlation
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discriminant analysis
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structural equation modeling and path analysis
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general COSAN model
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optimization methods include Levenberg-Marquart algorithm, ridge-stabilized Newton-Raphson, quasi-Newton, and conjugate gradient algorithms
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estimation methods include maximum likelihood, least squares, generalized least squares, weighted least squares, and diagonally weighted least squares
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equality and inequality constraints
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multiplicity-adjusted p-values
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multivariate one-way ANOVA model, discrete or continuous variables
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linear contrasts to compare proportions/means
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adjustments include bootstrap and permutation resampling
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multidimensional scaling models
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simple Euclidean and weighted Euclidean models
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ordinal, interval, ratio, or absolute levels of measurement
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fits distances, squared distances, log distances, or distances raised to any power
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Survival Analysis
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parametric models for failure-time data
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left, right, interval-censored
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model random disturbance with extreme value, normal, logistic, exponential, Weibull, log-normal, log-logistic, gamma distributions
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nonparametric methods
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Kaplan-Meier and lifetable estimates
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tests for homogeneity of survival distributions
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rank tests for association of response with covariates
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Cox regression (semi-parametric proportional hazards model)
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time-dependent covariates
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stratified analyses
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counting process formulation
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various model-selection methods
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four methods of handling ties
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Psychometric Analysis
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factor analysis
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simple and multiple correspondence analysis
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multidimensional scaling
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conjoint analysis
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principal components
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multidimensional preference analyses
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preference mapping
Cluster Analysis
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hierarchically cluster data
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some methods include average linkage, centroid method, complete linkage, density linkage, flexible-beta method, median method, single linkage, and Ward's minimum-variance method
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disjoint clustering of very large data sets
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approximate covariance estimation for clustering
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disjoint or hierarchical clustering based on correlation or covariance matrix
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clustering based on nonparametric density estimates
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numeric coordinates or distance data
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approximate significance tests for number of clusters
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hierarchical joins of nonsignificant clusters
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Nonparametric Analysis
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simple linear rank statistics based on Wilcoxon, median, Savage, and Van der Waerden scores
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exact p-values for simple linear rank statistics
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tests for scale differences include Siegel-Tukey, Ansari-Bradley, Klotz, and Mood
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Kolmogorov-Smirnov statistic
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kernel density estimation
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loess regression
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thin-plate smoothing splines
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