Thanks to Kit Baum, a -rvlrplot- package 
is now available on SSC for plotting 
residuals from a model fitted to time series. This
is a 
_r_esiduals _v_ersus _l_agged _r_esiduals _p_lot 
That is, -rvlrplot- plots residuals from the last model versus lagged
(i.e. lag 1) residuals. Data must have been -tsset- previously.
More precisely, residuals are whatever -predict, res- produces
after a model. The plot is restricted to the estimation sample.
The correlation between residuals and lagged residuals is
calculated quietly. This may be retrieved by -return list-
and then (say) used in a second pass giving the correlation
on the graph.
Stata 7 is required. 
*
*   For searches and help try:
*   http://www.stata.com/support/faqs/res/findit.html
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/