The arburg function reference is currently:

  RETURNED VALUES:
   a         %% [polynomial/vector] list of (P+1) autoregression coeffic-
             %%       ients; for data input x(n) and  white noise e(n),
             %%       the model is
             %%                             P+1
             %%       x(n) = sqrt(v).e(n) + SUM a(k).x(n-k)
             %%                             k=1


I think it should be:

 RETURNED VALUES:
   a         %% [polynomial/vector] list of (P+1) autoregression coeffic-
             %%       ients; for data input x(n) and  white noise e(n),
             %%       the model is
             %%              P+1
             %%       x(n) + SUM a(k).x(n-k+1) = sqrt(v).e(n)
             %%              k=2

or, if you prefer in terms of x(n):

             %%                             P+1
             %%       x(n) = sqrt(v).e(n) - SUM a(k).x(n-k+1)
             %%                             k=2
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