Dear experts,
Based on the examples in the reference manual, I conclude that
moment_calibration;
y_obs,y_obs, [0.5, 1.5]; //[unconditional variance]
end;
imposes the variance of y_obs to be between 0.5 and 1.5. But is moment_calibration always about covariances? For example, is
moment_calibration;
y_obs,y_obs(-1), [0.4, 0.8];
end;
a bound on the autocovariance of y_obs rather than, say, the autocorrelation of y_obs?
If so, is there a straight forward way to impose bounds on correlations? I understand that one can exploit \rho_{xy} = \sigma_{xy} / (\sigma_{x} \times \sigma_{y}), where \rho_{xy} is the correlation between x and y, and \sigma_{xy} is the covariance. But I would like to impose bounds on \rho_{xy} directly, without having to restrict e.g. \sigma_{x} or \sigma_{y}.
Thanks in advance for your input.
D