runby
安装
ssc install runby公卫论坛
更新 公卫考场
ssc install runby, replace 公卫人
runby loops over data
by-groups. A by-group is a subset of the initial data in memory and
includes all observations with the same value for the variables
specified in the by(varlist) option.
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You can run as many Stata commands as you want on each by-group. All you
need to do is to wrap these commands in a generic Stata program.
With each loop iteration, runby
replaces the data in memory with the by-group's data and runs your
program. What's left in memory when your program terminates is
considered results and is stored. When runby finishes, the data in memory contains the combined results from all by-groups. runby does not care about what's left in memory, it will grab it all and save it all. 公卫人
runby is a more efficient alternative to commands like statsby and loop based solutions (via levelsof and foreach ...). Because the commands run on data subsets, there is no need to use if or in qualifiers to target by-group observations. 公卫人
runby will be useful if you
need to run estimations by groups (see the panel-specific regressions
example in the help file). It will also be useful with some matching
problems when the number of possible pairwise combinations is too large
to handle in one pass. There's a great example of case-control pairing
in the help file.
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For large problems, there's a status
option that will trigger progress reports to print in the Results
window. These show the elapsed time, how many by-groups have been
processed so far (with how many that end with program errors or no
data), how many results observations have been saved, and finally an
estimated time to completion. The frequency of reports is 1 per second
initially and gradually slows down to every 5 minutes after 1 hour of
running time.
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For those who like to think outside the box, runby
can be useful for some data management tasks. You can easily partition a
large dataset into separate datasets, one for each by-group. You can
even use runby to automate the import of a bunch of files into Stata. You use runby
to loop over a list of files and let your program handle all the steps
needed to import each file. There are examples for each of these uses in
the help file. Here's an example from today that shows how to import problematic Excel files using runby.
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