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...e period. But when modeling y with order (1,1,1), it allows me to use the dummy variable over consecutive periods and appears meaningful. Does anyone have any insight as to why this is happening? -- View this message in context: http://r.789695.n4.nabble.com/Differencing-with-auto-arima-and-xreg-tp2279874p2279874.html Sent from the R help mailing list archive at Nabble.com.