What’s new in survey data
- Survey estimation may be combined with new SEM for
- Survey feature support for
models, xtmixed, including multilevel sampling weights and
robust variance estimators.
- Bootstrap standard errors for survey data using user-supplied bootstrap
- Survey SDR weights, which is to say, successive difference replicate
weights, which are supplied with many datasets from the U.S. Census
- Contrasts, which is to say, tests of
linear hypotheses involving factor variables and their interactions
from the most recently fit model. Tests include ANOVA-style tests of
main effects, simple effects, interactions, and nested effects. Effects
can be decomposed into comparisons with reference categories,
comparisons of adjacent levels, comparisons with the grand mean, and
more. New commands contrast and margins, contrast are
available after svy.
- Pairwise comparisons
of means, estimated cell means, estimated marginal
means, predictive margins of linear and nonlinear responses,
intercepts, and slopes. In addition to ANOVA-style comparisons,
comparisons can be made of population averages. New commands
pwcompare and margins, pwcompare are available after
- Graphs of margins,
marginal effects, contrasts, and pairwise
comparisons. Margins and effects can be obtained from linear or
nonlinear (for example, probability) responses. New command
marginsplot is available after svy.
- Estimation output improved.
- Implied zero coefficients now shown. When a coefficient is
omitted, it is now shown as being zero, and the reason it was
omitted—collinearity, base, empty—is shown in the
standard-error column. (The word “omitted” is shown if
the coefficient was omitted because of collinearity.)
- You can set displayed precision for all values in coefficient
tables using set cformat, set pformat, and set
sformat. Or you may use options cformat(),
pformat(), and sformat() now allowed on all
- Estimation commands now respect the width of the Results window.
This feature may be turned off by new display option
- You can now set whether base levels, empty cells, and omitted are
shown using set showbaselevels, set showemptycells,
and set showomitted.
- Survey goodness-of-fit available after logistic, logit,
and probit with new command estat gof.
- Survey coefficient of variation (CV) available with new command
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New in Stata 13
for more about what was added in Stata 13.