Hello,Could somebody tell me what is the difference between  theese 3 calls of 
functionsarma(x,order=c(1,0)), arima(x,order=c(1,0,0)) ar(x,order=1)?I expected 
same residuals of theese three models,but unexpectably for the first two R 
requiredinitial value of something (what?)...Thanks in advance! 
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