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Speaking Stata: How to move step by: step

Author

Listed:
  • Nicholas J. Cox

    (University of Durham, UK)

Abstract

The by varlist: construct is reviewed, showing how it can be used to tackle a variety of problems with group structure. These range from simply doing some calculations for each of several groups of observations to doing more advanced manipulations making use of the fact that with this construct, subscripts and the built-ins _n and _N are all interpreted within groups. A fairly complete tutorial on numerical evaluation of true and false conditions is included. Copyright 2002 by Stata Corporation.

Suggested Citation

  • Nicholas J. Cox, 2002. "Speaking Stata: How to move step by: step," Stata Journal, StataCorp LP, vol. 2(1), pages 86-102, February.
    • Handle: RePEc:tsj:stataj:v:2:y:2002:i:1:p:86-102
    Note: Correction: p.87, 3d para, "and which in turn go AFTER uppercase letters..."
    as

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    Citations

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    Cited by:

    1. Nicholas J. Cox, 2011. "Stata tip 101: Previous but different," Stata Journal, StataCorp LP, vol. 11(3), pages 472-473, September.
    2. Nicholas J. Cox, 2007. "Speaking Stata: Turning over a new leaf," Stata Journal, StataCorp LP, vol. 7(3), pages 413-433, September.
    3. L. Philip Schumm, 2006. "Stata tip 28: Precise control of dataset sort order," Stata Journal, StataCorp LP, vol. 6(1), pages 144-146, March.
    4. Nicholas J. Cox, 2011. "Speaking Stata: Compared with..," Stata Journal, StataCorp LP, vol. 11(2), pages 305-314, June.
    5. Nicholas J. Cox & Gary M. Longton, 2008. "Speaking Stata: Distinct observations," Stata Journal, StataCorp LP, vol. 8(4), pages 557-568, December.
    6. Nicholas J. Cox, 2002. "Speaking Stata: On numbers and strings," Stata Journal, StataCorp LP, vol. 2(3), pages 314-329, August.
    7. Nicholas J. Cox, 2008. "Stata tip 71: The problem of split identity, or how to group dyads," Stata Journal, StataCorp LP, vol. 8(4), pages 588-591, December.
    8. Nicholas J. Cox, 2007. "Speaking Stata: Counting groups, especially panels," Stata Journal, StataCorp LP, vol. 7(4), pages 571-581, December.
    9. Nicholas J. Cox, 2005. "Speaking Stata: The protean quantile plot," Stata Journal, StataCorp LP, vol. 5(3), pages 442-460, September.
    10. Nicholas J. Cox, 2012. "Speaking Stata: Output to order," Stata Journal, StataCorp LP, vol. 12(1), pages 147-158, March.
    11. Nicholas J. Cox, 2007. "Speaking Stata: Identifying spells," Stata Journal, StataCorp LP, vol. 7(2), pages 249-265, June.

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