QN() + DR() + WN() + RW() + AR1() + ARMA(1,2)
AR1(phi=.9,sigma2=.1) + WN(sigma2=1) +
RW(sigma2=.3) + DR(slope=.5) + QN(q2=.9) + ARMA(ar=c(.3,.1),ma=c(.3,.2), sigma2= .99)
AR1(.9,.1) + WN(1) + RW(.3) + DR(.5) + QN(.9) + ARMA(c(.3,.1),c(.3,.2), .99)
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