st: foreach loop

[R Zhang <r05zhang@gmail.com>]

Hi Statalisters,

I use the following code to generate lags and leads

sort gvkey year
tsset gvkey year

foreach x in cover  dred eiss ered ndiss neiss nlevup tfina {

gen `x'_D1=D.`x'
  gen `x'_L1=L.`x'

  gen `x'_L2=L2.`x'

  gen `x'_F1=F.`x'

  gen `x'_F2=F2.`x'
}

what puzzles me is that when I use summarize command to check values
of the lags for neiss nlevup tfina , stata says variables neiss_L1,
nlevup_L1, tfina_L1,not found.

neiss nlevup tfina  are not missing. and the lags for dred eiss ered
ndiss were created.

what did i do wrong?

thanks,
-Rochelle
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