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1 2 3 4 5 6 7 8 9 | # PS9.1, for Examples 9.1 and 9.2 illustrating
# autocorrelation and the residual plot
open data6-6
genr time
ols farmpop const time
genr ut=$uhat
genr ut1=ut(-1)
corr ut ut1
textplot ut time
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