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A Modern Gauss-Markov Theorem? Really?

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abstract

We show that the theorems in Hansen (2021a) (the version accepted by Econometrica), except for one, are not new as they coincide with classical theorems like the good old Gauss-Markov or Aitken Theorem, respectively; the exceptional theorem is incorrect. Hansen (2021b) corrects this theorem. As a result, all theorems in the latter version coincide with the above mentioned classical theorems. Furthermore, we also show that the theorems in Hansen (2022) (the version published in Econometrica) either coincide with the classical theorems just mentioned, or contain extra assumptions that are alien to the Gauss-Markov or Aitken Theorem.

fields

stat.ME 1

years

2026 1

verdicts

ACCEPT 1

representative citing papers

Extended rank regression for all ordinal data

stat.ME · 2026-07-27 · accept · novelty 6.0

Extended rank likelihood regression unifies continuous and ordinal outcomes under a monotone latent linear model with no asymptotic efficiency loss at the continuous and binary extremes and practical conditional prediction intervals.

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  • Extended rank regression for all ordinal data stat.ME · 2026-07-27 · accept · none · ref 42 · internal anchor

    Extended rank likelihood regression unifies continuous and ordinal outcomes under a monotone latent linear model with no asymptotic efficiency loss at the continuous and binary extremes and practical conditional prediction intervals.