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Stata Quick Reference and Index

Stata Quick Reference and Index

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18<br />

Nonparametric statistics<br />

[R] kdensity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Univariate kernel density estimation<br />

[R] ksmirnov . . . . . . . . . . . . . . . . . . . . . Kolmogorov–Smirnov equality-of-distributions test<br />

[R] kwallis . . . . . . . . . . . . . . . . . . . . . . . . Kruskal–Wallis equality-of-populations rank test<br />

[R] lowess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lowess smoothing<br />

[R] lpoly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Kernel-weighted local polynomial smoothing<br />

[R] lv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Letter-value displays<br />

[R] nptrend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test for trend across ordered groups<br />

[R] qreg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Quantile regression<br />

[R] ranksum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equality tests on unmatched data<br />

[R] roc . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver operating characteristic (ROC) analysis<br />

[R] runtest . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test for r<strong>and</strong>om order<br />

[R] signrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equality tests on matched data<br />

[R] smooth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Robust nonlinear smoother<br />

[R] spearman . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spearman’s <strong>and</strong> Kendall’s correlations<br />

[R] symmetry . . . . . . . . . . . . . . . . . . . . . . . . . . Symmetry <strong>and</strong> marginal homogeneity tests<br />

Ordinal outcomes<br />

[U] Chapter 20 . . . . . . . . . . . . . . . . . . . . . . . . . . . Estimation <strong>and</strong> postestimation comm<strong>and</strong>s<br />

[R] asroprobit . . . . . . . . . . . . . . . . . . . . Alternative-specific rank-ordered probit regression<br />

[R] ologit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered logistic regression<br />

[R] oprobit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ordered probit regression<br />

[R] rologit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rank-ordered logistic regression<br />

Other statistics<br />

[R] alpha . . . . . . . . . . Compute interitem correlations (covariances) <strong>and</strong> Cronbach’s alpha<br />

[R] ameans . . . . . . . . . . . . . . . . . . . . . . . . . . . Arithmetic, geometric, <strong>and</strong> harmonic means<br />

[R] brier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brier score decomposition<br />

[R] centile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Report centile <strong>and</strong> confidence interval<br />

[R] kappa . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Interrater agreement<br />

[MV] mvtest correlations . . . . . . . . . . . . . . . . . . . . . . . . . . . . Multivariate tests of correlations<br />

[R] pcorr . . . . . . . . . . . . . . . . . . . . . . . . . . . . Partial <strong>and</strong> semipartial correlation coefficients<br />

[D] pctile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Create variable containing percentiles<br />

[D] range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Generate numerical range<br />

Pharmacokinetic statistics<br />

[U] Section 26.22 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pharmacokinetic data<br />

[R] pk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pharmacokinetic (biopharmaceutical) data<br />

[R] pkcollapse . . . . . . . . . . . . . . . . . . . . . . . Generate pharmacokinetic measurement dataset<br />

[R] pkcross . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analyze crossover experiments<br />

[R] pkequiv . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Perform bioequivalence tests<br />

[R] pkexamine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Calculate pharmacokinetic measures<br />

[R] pkshape . . . . . . . . . . . . . . . . . . . . . . . . . . . Reshape (pharmacokinetic) Latin-square data<br />

[R] pksumm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Summarize pharmacokinetic data<br />

Power <strong>and</strong> sample size<br />

[R] sampsi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Sample size <strong>and</strong> power determination<br />

[ST] stpower . . . . . Sample-size, power, <strong>and</strong> effect-size determination for survival analysis

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