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Saved results, details

  • four classes of saved results

    r class general commands summarize 
    e class estimation commands
    regress 
    s class parsing commands
    _pred_se 
    n class none of the above; default generate 
  • command must be explicitly declared rclass, eclass, or sclass if it is to return results:
          program define mycmd6, rclass
  • macros, scalars, and matrices may be stored