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help: varprod                                                        dialog: va
> rprod
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        +-------+
    ----+ Title +------------------------------------------------------------

 varprod: Generate Row Product of Variables

        +--------+
    ----+ Syntax +-----------------------------------------------------------

 egen [type] newvar = varprod(varlist) [if] [in]

        +-------------+
    ----+ Description +------------------------------------------------------

  varprod generates (row) product of variables in varlist, and looks like
  function (rowtotal) in egen command that creates (row) sum of the variables
  in varlist

        +----------+
    ----+ Examples +---------------------------------------------------------

        clear all

        sysuse varprod.dta , clear

        egen px1 = varprod(x1 x2 x3 x4)

        egen px2 = varprod(x*)

        gen  px3 = x1*x2*x3*x4
        
        list px1 px2 px3

        egen pxy1 = varprod(x1 x2 x3 x4 y1 y2 y3)

        egen pxy2 = varprod(x* y*)

        gen  pxy3 = x1*x2*x3*x4*y1*y2*y3

        list pxy1 pxy2 pxy3

        +--------+
    ----+ Author +-----------------------------------------------------------

  Emad Abd Elmessih Shehata
  Assistant Professor
  Agricultural Research Center - Agricultural Economics Research Institute - Eg
> ypt
  Email:   emadstat@hotmail.com
  WebPage:                http://emadstat.110mb.com/stata.htm
  WebPage at IDEAS:       http://ideas.repec.org/f/psh494.html
  WebPage at EconPapers:  http://econpapers.repec.org/RAS/psh494.htm

        +------------------+
    ----+ varprod Citation +-------------------------------------------------

    Shehata, Emad Abd Elmessih (2012)
    VARPROD: "Stata Module to Generate Row Product of Variables"