Sample size and power determination

• Two-sample test of equality of means
• One-sample test of means
• Two-sample test of equality of proportions
• One-sample test of proportions
• Repeated measurements of the outcome on each experimental unit
• Survival studies

Nonlinear least-squares regression

Nonlinear seemingly unrelated regression

Stepwise regression

• Linear
• Complementary log-log
• Cox
• GLM
• Interval
• Logistic
• Conditional logistic
• Negative binomial
• Ordered logit
• Ordered probit
• Poisson
• Probit
• Quantile
• Skewed logistic
• Tobit and censored-normal
• Exponential, Weibull, Gompertz, lognormal, log-logistic, generalized gamma

Nested model statistics

Orthogonal polynomials

Cronbach’s alpha

Kappa measure of interrater agreement

Kernel-density estimation

Missing-value imputation

• Best-subset regression

Collecting statistics into a dataset

• Collection from any command
• Collection of results for each group or subgroup of observations
• Collection from user-written or “official” commands

Drawing samples from multivariate normal distribution

Creating datasets with specified correlation structure

Rolling and recursive analyses

Mathematical functions

• Absolute value
• Arccosine returning radians
• Arcsine returning radians
• Arctangent returning radians
• Two-argument arctangent
• Sine of radians
• Tangent of radians
• Cosine of radians
• Combinatorial function
• Exponentiation
• Natural logarithm
• Natural log factorial
• ln(gamma(x)) (ln((x−1)!) for integer x)
• Base 10 logarithm
• Modulus of x with respect to y
• Square root
• Digamma function
• Trigamma function
• Hyperbolic tangent
• Log of odds ratio
• Inverse log of odds ratio
• Complementary log-log
• Inverse complementary log-log
• Ceiling
• Floor
• Minimum
• Maximum
• Relative difference
• Running sum
• Sign

Statistical functions

• Binomial distribution
• Cumulative and inverse F distribution
• F density
• Incomplete gamma
• Inverse incomplete gamma
• Gamma density
• Incomplete beta
• Noncentral beta density
• Inverse binomial
• Cumulative and inverse chi-squared
• Inverse cumulative noncentral chi-squared
• Upper tail of cumulative beta distribution
• Inverse tail of cumulative beta distribution
• Upper tail of cumulative gamma distribution
• Inverse tail of cumulative gamma distribution
• Upper tail of right cumulative binomial
• Cumulative noncentral chi-squared
• Standard normal density
• Cumulative normal
• Inverse cumulative normal
• Bivariate normal
• Cumulative bivariate normal
• Student's 2-tailed t distribution
• t density
• Inverse 2-tailed cumulative t distribution
• Noncentrality parameter L for noncentral chi-squared
• First and second derivatives of gamma
• Noncentral F