Hi,

	I have missing values in my time series. "na.action = na.pass" works for acf and pacf. Why do I get the following error for the ccf? 


> ts(matrix(c(dev$u[1:10],dev$q[1:10]),ncol=2),start=1,freq=1) 
Time Series:
Start = 1 
End = 10 
Frequency = 1 
   Series 1 Series 2
 1 68.00000 138.4615
 2 70.00000 355.5556
 3 68.76000 304.3200
 4 68.00000 231.4286
 5 69.74194 357.4963
 6       NA       NA
 7 67.45455 174.8697
 8 66.00000 144.0000
 9 73.50000 287.6471
10 70.00000 172.6027


> ccf(x = ts.data[,1], y = ts.data[,2], na.action = na.pass, ylab = "CCF")
Error in na.fail.default(as.ts(x)) : missing values in object

	Thank you
	Paul
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