Talk:Errors-in-variables models

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Page moved from the “Errors-in-variables model”.

References[edit]

There is currently the {{refimprove}} tag on the page. Could somebody elaborate — which exactly statements seems controversial and require additional referencing, or maybe whether the quality of existing references is unsatisfactory? ... stpasha » talk » 02:31, 12 September 2009 (UTC)

Measurement error, attenuation[edit]

Somehow Measurement error should be related to this subject and thus to regression dilution and disattenuation, preferably by something more than a "See also" or three.

The proliferation of articles on regression dilution, disattenuation, and correction for attenuation has been mentioned to the statistics project WP:WPSTAT. --P64 (talk) 17:16, 29 March 2010 (UTC)

Regression dilution and disattenuation are just two very narrow topics referring to the old-school methods of correction for measurement error in a simple linear regression. These methods are probably still used in practice, at least judging from the fact that such procedures still exist in modern statistical packages such as Stata. However the generic term “errors-in-variables models” or “measurement error models” refer to the whole variety of methods for dealing with this problem of regression dilution. The difference is the same as between “regression models” and “linear regression”.
As for measurement error itself — this should probably be converted into a disambiguation article. It could refer to either the observational error, or the theory of propagation of uncertainty, or this topic.  // stpasha »  07:17, 30 March 2010 (UTC)

coding issues[edit]

The "Motivational example" still needs concise explanation of variance star and what happened to variance epsilon (with TeX). --P64 (talk) 15:15, 30 March 2010 (UTC)

User:stpasha has provided the latter and has also revised some of the comma, single-quote, and double-quote characters inside and outside the |math| code.
I had revised some double-qmarks and added some thin spaces earlier (or tried to do so). Using two different computer stations early and late this afternoon (American EST) I have noticed some differences between them in the displays of both the code and the current version of the article (which I must examine later, no time now). Other editors, too, may find it instructive to compare the last several versions, using different browser settings and wikipedia settings. --P64 (talk) 21:46, 30 March 2010 (UTC)

Second Paragraph needs clarification[edit]

It is not clear what is going to 0 in the second paragraph, the bias of what? MATThematical (talk) 18:14, 23 April 2010 (UTC)

It was a typo. Nothing goes to zero, the estimator is simply biased towards zero — meaning that its magnitude is smaller than that of the true parameter.  // stpasha »  18:43, 23 April 2010 (UTC)

Is each of the proposed remedies unbiased and consistent?[edit]

The lede and the motivational example identify the problem with errors in right-side variables as one of bias and inconsistency. It's a long article, so maybe I've missed it, but I don't think the article states anywhere whether any of the proposed approaches is unbiased and/or consistent. Duoduoduo (talk) 20:58, 23 February 2011 (UTC)

Every proposed estimator is consistent (otherwise it would never be published), however unbiasedness is probably the luxury none of them can afford.  // stpasha »  02:12, 24 February 2011 (UTC)
If you have references for that, it would be good to put it into the article. Duoduoduo (talk) 20:23, 24 February 2011 (UTC)

direction of bias ambiguous[edit]

Is there any evidence for this statement

"(although in multivariate regression the direction of bias is ambiguous)"?

If not, it should be removed. Muhali (talk) 02:04, 18 April 2012 (UTC)