Turn off autocorrelation

[lindeloev]

Turning off would just be changing to 0th order:

segments = list(
    y ~ 1 + x,
    ~ 0 + ar(1),  # start AR(1)
    ~ 0 + ar(0)  # Stop all AR
)

Implementation-wise, the "0" would just set zeros for the involved parameters, e.g., ar_[i_] = 0, i.e., leaving it purely to sigma to model the residuals.