## In Stata, how do I store the descriptive statistics of a variable in a macro?

In Stata, the `.tabstat`

command computes
aggregate statistics of variables such as mean and standard deviation,
and its `save`

option stores these statistics in a
matrix. For example, to get the N, mean, and standard deviation of
personal income, enter:

The `stat()`

option specifies the aggregate statistics to
be computed. `N`

(the number of valid observations), mean,
and standard deviation are stored in a matrix
`r(StatTotal)`

. You may check for the presence of the
matrix using the `return list`

command. You can also list
the values of the matrix by running ```
matrix list
r(StatTotal)
```

as follows:
. return list
matrices:
r(StatTotal) : 3 x 1
. matrix list r(StatTotal)
To convert the special matrix into a typical matrix using the
`.matrix`

command, enter:

Finally, to convert a scalar, for example, the mean of the variable, into a macro, enter:

. local avg=stats[2,1]If you want to save the matrix as a variable, enter the `.svmat`

command instead:

You may clear memory before converting the matrix. Since the matrix
has only one column (3x1), you may have one variable `var1`

with three observations for `N`

, mean, and standard
deviation.

If you have questions about using statistical and mathematical software at Indiana University, email UITS Research Analytics (formerly known as the Stat/Math Center). Research Analytics is located on the IU Bloomington campus at Woodburn Hall 200, and is open for consultation by appointment Monday-Friday 9am-5pm. For more, visit Research Analytics on the web, or call 812-855-4724 (IUB) or 317-278-4740 (IUPUI).

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*all*.

Last modified on

*January 13, 2014*.

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