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
Nonlinear least-squares
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
Orthogonal polynomials
Cronbach's alpha
Kappa measure of interrater agreement
Kernel-density estimation
Missing-value imputation
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
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Mathematical functions
- absolute value
- arc-cosine returning radians
- arc-sine returning radians
- arc-tangent returning radians
- two-argument arc-tangent
- 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
- 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
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