Stata 15 help for ameans

[R] ameans -- Arithmetic, geometric, and harmonic means

Syntax

ameans [varlist] [if] [in] [weight] [, options]

options Description ------------------------------------------------------------------------- Main add(#) add # to each variable in varlist only add # only to variables with nonpositive values level(#) set confidence level; default is level(95) ------------------------------------------------------------------------- by is allowed; see [D] by. aweights and fweights are allowed; see weight.

Menu

Statistics > Summaries, tables, and tests > Summary and descriptive statistics > Arith./geometric/harmonic means

Description

ameans computes the arithmetic, geometric, and harmonic means, with their corresponding confidence intervals, for each variable in varlist or for all the variables in the data if varlist is not specified. gmeans and hmeans are synonyms for ameans.

Options

+------+ ----+ Main +-------------------------------------------------------------

add(#) adds the value # to each variable in varlist before computing the means and confidence intervals. This option is useful when analyzing variables with nonpositive values.

only modifies the action of the add(#) option so that it adds # only to variables with at least one nonpositive value.

level(#) specifies the confidence level, as a percentage, for confidence intervals. The default is level(95) or as set by set level.

Examples

Setup . webuse systolic

Compute arithmetic, geometric, and harmonic means . ameans systolic

Same as above, but add 7 to systolic before computing means . ameans systolic, add(7)

Video example

Descriptive statistics in Stata

Stored results

ameans stores the following in r():

Scalars r(N) number of nonmissing observations; used for arithmetic mean r(N_pos) number of nonmissing positive observations; used for geometric and harmonic means r(mean) arithmetic mean r(lb) lower bound of confidence interval for arithmetic mean r(ub) upper bound of confidence interval for arithmetic mean r(Var) variance of untransformed data r(mean_g) geometric mean r(lb_g) lower bound of confidence interval for geometric mean r(ub_g) upper bound of confidence interval for geometric mean r(Var_g) variance of ln x_i r(mean_h) harmonic mean r(lb_h) lower bound of confidence interval for harmonic mean r(ub_h) upper bound of confidence interval for harmonic mean r(Var_h) variance of 1/x_i r(level) confidence level of confidence interval


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