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For questions pertaining to methods to estimate input parameters based upon output data.

4 votes

Advantage of diagonal "jitter" for numerical stability?

Think of the simplest case when $\Phi$ is a scalar value. Not well defined: $$ \boldsymbol \theta^\text{ML} = (0^T 0)^{-1}0^T ~ y = \frac{1}{0} 0~y= \frac{0}{0} $$ Well defined: $$ \boldsymbol \theta …
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