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help oneway dialog: oneway
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Title
[R] oneway -- One-way analysis of variance
Syntax
oneway response_var factor_var [if] [in] [weight] [, options]
options description
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Main
bonferroni Bonferroni multiple-comparison test
scheffe Scheffe multiple-comparison test
sidak Sidak multiple-comparison test
tabulate produce summary table
[no]means include or suppress means; default is means
[no]standard include or suppress standard deviations; default is
standard
[no]freq include or suppress frequencies; default is freq
[no]obs include or suppress number of obs; default is obs if
data are weighted
noanova suppress the ANOVA table
nolabel show numeric codes, not labels
wrap do not break wide tables
missing treat missing values as categories
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by is allowed; see [D] by.
aweights and fweights are allowed; see weight.
Description
The oneway command reports one-way analysis-of-variance (ANOVA) models
and performs multiple-comparison tests.
If you wish to fit more complicated ANOVA layouts or wish to fit
analysis-of-covariance (ANOCOVA), see [R] anova.
See [D] encode for examples of fitting ANOVA models on string variables.
See [R] loneway for an alternative oneway with slightly different
features.
Options
+------+
----+ Main +-------------------------------------------------------------
bonferroni reports the results of a Bonferroni multiple-comparison test.
scheffe reports the results of a Scheffe multiple-comparison test.
sidak reports the results of a Sidak multiple-comparison test.
tabulate produces a table of summary statistics of the response_var by
levels of the factor_var. The table includes the mean, standard
deviation, frequency, and, if the data are weighted, the number of
observations. Individual elements of the table may be included or
suppressed by the [no]means, [no]standard, [no]freq, and [no]obs
options. For example, typing
. oneway response factor, tabulate means standard
produces a summary table that contains only the means and standard
deviations. You could achieve the same result by typing
. oneway response factor, tabulate nofreq
[no]means includes or suppresses only the means from the table produced
by the tabulate option. See tabulate above.
[no]standard includes or suppresses only the standard deviation from the
table produced by the tabulate option. See tabulate above.
[no]freq includes or suppresses only the frequencies from the table
produced by the tabulate option. See tabulate above.
[no]obs includes or suppresses only the reported number of observations
from the table produced by the tabulate option. If the data are not
weighted, only the frequency is reported. If the data are weighted,
the frequency refers to the sum of the weights. See tabulate above.
noanova suppresses the display of the ANOVA table.
nolabel causes the numeric codes to be displayed rather than the value
labels in the ANOVA and multiple-comparison test tables.
wrap requests that Stata not break up wide tables to make them readable.
missing requests that missing values of factor_var be treated as a
category rather than as observations to be omitted from the analysis.
Examples
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Setup
. webuse apple
. oneway weight treatment
Obtaining observed means
. oneway weight treatment, tabulate
Bonferroni multiple-comparison test
. oneway weight treatment, bonferroni
Scheffe multiple-comparison test
. oneway weight treatment, scheffe
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Setup
. webuse census8
With weighted data
. oneway drate region [w=pop]
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Saved results
oneway saves the following in r():
Scalars
r(N) number of observations
r(F) F statistic
r(df_r) within-group degrees of freedom
r(mss) between-group sum of squares
r(df_m) between-group degrees of freedom
r(rss) within-group sum of squares
r(chi2bart) Bartlett's chi-squared
r(df_bart) Bartlett's degrees of freedom
Also see
Manual: [R] oneway
Online: [R] anova, [R] loneway
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