看 table 命令
Examples

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    Setup
        . sysuse auto

    One-way table; frequencies shown by default
        . table rep78

    One-way table; show count of nonmissing observations for mpg
        . table rep78, contents(n mpg)

    One-way table; multiple statistics on mpg requested
        . table rep78, c(n mpg mean mpg sd mpg median mpg)

    Add formatting
        . table rep78, c(n mpg mean mpg sd mpg median mpg) format(%9.2f)

    Two-way table; frequencies shown by default
        . table rep78 foreign

    Two-way table; show means of mpg for each cell
        . table rep78 foreign, c(mean mpg)

    Add formatting
        . table rep78 foreign, c(mean mpg) format(%9.2f) center
        . table foreign rep78, c(mean mpg) format(%9.2f) center

    Add row and column totals
        . table foreign rep78, c(mean mpg) format(%9.2f) center row col

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    Setup
        . webuse byssin

    Three-way table
        . table workplace smokes race [fw=pop], c(mean prob)

    Add formatting
        . table workplace smokes race [fw=pop], c(mean prob) format(%9.3f)

    Request supercolumn totals
        . table workplace smokes race [fw=pop], c(mean prob) format(%9.3f) sc

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    Setup
        . webuse byssin1

    Four-way table
        . table workplace smokes race [fw=pop], by(sex) c(mean prob) format(%9.3f)

    Four-way table with supercolumn, row, and column totals
        . table workplace smokes race [fw=pop], by(sex) c(mean prob) format(%9.3f) sc col row
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