This FAQ illustrates the nmissing and npresent
commands which show you the number of missing, and number of non-missing
values for your variables. The
nmissing and npresent commands were written by Nicholas J. Cox
and you can download them using search nmissing (see
How can I use the search command to search for programs and get additional
help? for more information about using search).
Let’s illustrate use of the
nmissing
and npresent commands using
the high school and beyond data file we use in our Stata Classes.
use https://stats.idre.ucla.edu/stat/stata/notes/hsb1, clear (highschool and beyond (200 cases))
The nmissing command shows us that one of the
variables, science, has missing data, and it has 5 missing values.
By contrast, the npresent command shows us the number of non-missing
values for all of the variables in our data file. From this, we see all
of the variables have 200 non-missing observations, except for science that
has 195 non-missing observations.
nmissing science 5 npresent id 200 gender 200 race 200 ses 200 schtyp 200 prog 200 read 200 write 200 math 200 science 195 socst 200
For More Information
For more information on similar commands,
see the help or reference manual about the
summarize
, inspect, and
codebook
commands.