@article{Cox:180084,
      recid = {180084},
      author = {Cox, Nicholas J.},
      title = {Speaking Stata: Compared with ...},
      journal = {Stata Journal},
      address = {2011},
      number = {199-2016-2728},
      pages = {10},
      year = {2011},
      abstract = {any problems in data management center on relating values  to values in other observations, either within a dataset as  a whole or within groups such as panels. This column  reviews some basic Stata techniques helpful for such tasks,  including the use of subscripts, summarize, by:, sum(),  cond(), and egen. Several techniques exploit the fact that  logical expressions yield 1 when true and 0 when false.  Dividing by zero to yield missings is revealed as a  surprisingly valuable device.},
      url = {http://ageconsearch.umn.edu/record/180084},
      doi = {https://doi.org/10.22004/ag.econ.180084},
}