= SPSS Macro Looping =

SPSS macros offer the following options for '''looping'''.

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== Ranges ==

{{{
define !per_year(var = !tokens(1)
                /timevar = !tokens(1)
                /start = !tokens(1)
                /end = !tokens(1))
  !DO !y = !start !TO !end !BY 1
    temporary.
    select if !timevar=!y.
    frequencies /variables=!var.
    execute.
  !DOEND
!enddefine

!per_year var=population timevar=year start=2000 end=2008.
}}}

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== Iteration ==

{{{
define !each_year(var = !tokens(1)
                 /timevar = !tokens(1)
                 /years = !cmdend)
  !DO !y !IN (!years)
    temporary.
    select if !timevar=!y.
    frequencies /variables=!var.
    execute.
  !DOEND
!enddefine

!each_year var=population timevar=year years=2000 2002 2008.
}}}



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