..-
help for ^acplot^
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Display a correlogram
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    ^acplot^ varname [^, l^ags^(^#^)^ ^se^ ^pr^int ^sp^ike graph_options ]

Description
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^acplot^ graphs the first ^lags()^ autocorrelations.

Options
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^lags(^#^)^ specifies the number of lags.  If not specified, the first
    20 autocorrelations are graphed.

^se^ adds standard-error bands to the graph.

^print^ prints out the autocorrelations. If ^se^ is requested, the
    standard errors are also printed.

^spike^ causes the autocorrelations to be shown as a series of spikes
    drawn vertically from zero.

graph_options refers to any of the options of ^graph, twoway^.

Examples
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 . ^acplot durtemp^
 . ^acplot durtemp, sp^
 . ^acplot durtemp, se pr^

Methods and formulas
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The standard error of the autocorrelations is estimated by Bartlett's
approximation.

Author
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         Nicholas J. Cox, University of Durham, after Sean Becketti's ac.
         n.j.cox@@durham.ac.uk