Talk:Weighted least squares

Not useful for those unfamiliar with the language of matrix math
This article is fine as a reference for experts, but offers very little utility for students (for example) at the advanced high school or freshman undergraduate level who may find this information useful but do not yet speak the language of matrix algebra. It is perfectly straightforward to explain weighted fitting in the language of summation signs; I propose this article needs such an expansion.

152.3.34.82 (talk) 14:54, 18 October 2019 (UTC)

Mistakes
There is something wrong with last line of formula, it should be W in the middle instead of W^2.

KL

Hi. I do not see the mistake. Please edit as needed.

ManelMR 15:33, 26 September 2007 (UTC)

In the Linear Algebra Derivation, the pre multiplication of the parameter vector, Beta, by the traspose of the design matrix,X, is dimensionally incorrect. The system of equations shown is given by themultiplication of beta by X. For the rest of the derivation the places of X and transpose(X) should be swapped.

LivioM (talk) 02:16, 8 February 2008 (UTC)

-- In the first equation I believe it should be r_i and not r^2_i. 192.114.105.254 (talk) 11:08, 26 September 2018 (UTC)

A major proposal
Please see talk:least squares for details, which include a proposal to merge this article into a revised version of linear least squares. Petergans (talk) 17:45, 22 January 2008 (UTC)

Missing expressions?
The expressions given above are based on the implicit assumption that the errors are uncorrelated with each other and with the independent variables and have equal variance.

There are no expressions above this line. Either there are expressions missing or somehow this text is an artefact from a prior version? Lerad (talk) 11:56, 11 April 2019 (UTC)