ftools

Fast Stata commands for large datasets.

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ftools, written by Sergio Correia, includes commands such as fcollapse for creating datasets of summary statistics, fmerge for merging datasets with one-to-one or many-to-one matching, and flevelsof for identifying distinct levels of a variable. The ftools suite also includes a Mata class for working with factors. The Stata commands in ftools are based on this Mata class. You can use it to implement your own commands too. 公卫百科
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安装
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cap ado uninstall ftools
ssc install ftools 
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