> From <@uconnvm.uconn.edu:kent@darwin.eeb.uconn.edu> Wed Jan 7 12:51 GMT 1998 > To: ripley@stats.ox.ac.uk (Prof Brian Ripley) > Cc: s-news@utstat.toronto.edu > Subject: Re: Summary of Robust Regression Algorithms > From: kent@darwin.eeb.uconn.edu (Kent E. Holsinger) > > >>>>> "Brian" == Prof Brian Ripley writes: > > Brian> My best example of this not knowing the literature is the > Brian> Hauck-Donner (1977) phenomenon: a small t-value in a > Brian> logistic regression indicates either an insignificant OR a > Brian> very significant effect, but step.glm assumes the first, > Brian> and I bet few users of glm() stop to think. > > All right I confess. This is a new one for me. Could some one explain > the Hauck-Donner effect to me? I understand that the t-values from > glm() are a Wald approximation and may not be terribly reliable, but I > don't understand how a small t-value could indicate "either an > insignificant OR a very significant effect." > > Thanks for the help. It's finding gems like these that make this group > so extraordinarily valuable.

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There is a description in V&R2, pp. 237-8., given below. I guess I was teasing people to look up Hauck-Donner phenomenon in our index. (I seem to remember this was new to my co-author too, so you were in good company. This is why it is such a good example of a fact which would be useful to know but hardly anyone does. Don't ask me how I knew: I only know that I first saw this in about 1980.)

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dCode se réserve la propriété du code source du script Tirage au Sort en ligne. Sauf code licence open source explicite (indiqué Creative Commons / gratuit), tout algorithme, applet, snippet ou logiciel (convertisseur, solveur, chiffrement / déchiffrement, encodage / décodage, encryptage / décryptage, traducteur) ou toute fonction (convertir, résoudre, décrypter, encrypter, déchiffrer, chiffrer, décoder, traduire) codé en langage informatique (PHP, Java, C#, Python, Javascript, Matlab, etc.) dont dCode a les droits ne sera pas cédé gratuitement. Pour télécharger le script en ligne Tirage au Sort pour un usage hors ligne, PC, iPhone ou Android, demandez un devis sur la page de contact !

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OBS – drawn securities: Any securities such as bonds and preferred stock which have been called for redemption. The term "drawn" arises from the fact that such a redemption is accomplished by the use of lots which are "drawn" or chosen by chance. Source CONT – Les obligations devant faire l'objet d'un amortissement sont désignées par un tirage au sort dont le résultat est publié au Journal officiel sous forme d'un tableau d'amortissement. La liste des numéros tirés au sort doit être publiée au moins vingt jours avant la date de remboursement (Décret n° 49-301 du 28.02.1949). Source

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> From <@uconnvm.uconn.edu:kent@darwin.eeb.uconn.edu> Wed Jan 7 12:51 GMT 1998 > To: ripley@stats.ox.ac.uk (Prof Brian Ripley) > Cc: s-news@utstat.toronto.edu > Subject: Re: Summary of Robust Regression Algorithms > From: kent@darwin.eeb.uconn.edu (Kent E. Holsinger) > > >>>>> "Brian" == Prof Brian Ripley writes: > > Brian> My best example of this not knowing the literature is the > Brian> Hauck-Donner (1977) phenomenon: a small t-value in a > Brian> logistic regression indicates either an insignificant OR a > Brian> very significant effect, but step.glm assumes the first, > Brian> and I bet few users of glm() stop to think. > > All right I confess. This is a new one for me. Could some one explain > the Hauck-Donner effect to me? I understand that the t-values from > glm() are a Wald approximation and may not be terribly reliable, but I > don't understand how a small t-value could indicate "either an > insignificant OR a very significant effect." > > Thanks for the help. It's finding gems like these that make this group > so extraordinarily valuable.

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Une fois la liste créée, vous pouvez si vous le souhaitez ajouter des règles spéciales très utiles. Un exemple Marie et Pierre qui sont mariés font partie du tirage au sort que vous réalisez pour Noël avec vos amis mais vous ne souhaitez pas que Marie tombe sur Pierre et inversement car c'est mieux que les couples ne tombent pas ensembles... vous pourrez ajouter cette règle au tirage au sort.

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To expand a little, if |t| is small it can EITHER mean than the Taylor expansion works and hence the likelihood ratio statistic is small OR that |\hat\beta_i| is very large, the approximation is poor and the likelihood ratio statistic is large. (I was using `significant' as meaning practically important.) But we can only tell if |\hat\beta_i| is large by looking at the curvature at \beta_i=0, not at |\hat\beta_i|. This really does happen: from later on in V&R2:
Bien que les tirages au sort des maisons d'édition d'éditeurs soient légitimes, un certain nombre d'escrocs essaient de tirer parti de la popularité de ces loteries en utilisant le nom de PCH pour attirer les victimes. Si vous avez reçu une notification de prix de la part de PCH et que vous n'êtes pas sûr que ce soit légitime ou non, consultez Vraiment gagné de PCH? pour obtenir des conseils sur la façon de vérifier votre victoire.

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To expand a little, if |t| is small it can EITHER mean than the Taylor expansion works and hence the likelihood ratio statistic is small OR that |\hat\beta_i| is very large, the approximation is poor and the likelihood ratio statistic is large. (I was using `significant' as meaning practically important.) But we can only tell if |\hat\beta_i| is large by looking at the curvature at \beta_i=0, not at |\hat\beta_i|. This really does happen: from later on in V&R2: 

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There is a little-known phenomenon for binomial GLMs that was pointed out by Hauck & Donner (1977: JASA 72:851-3). The standard errors and t values derive from the Wald approximation to the log-likelihood, obtained by expanding the log-likelihood in a second-order Taylor expansion at the maximum likelihood estimates. If there are some \hat\beta_i which are large, the curvature of the log-likelihood at \hat{\vec{\beta}} can be much less than near \beta_i = 0, and so the Wald approximation underestimates the change in log-likelihood on setting \beta_i = 0. This happens in such a way that as |\hat\beta_i| \to \infty, the t statistic tends to zero. Thus highly significant coefficients according to the likelihood ratio test may have non-significant t ratios.

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