Talk:Root mean square deviation

message: "Regression ratio"/"learning ratio"?  When measuring the performance of a predictive model (e.g. regression) you can divide the RMSD by the standard deviation of the target data.  When greater than or equal to one you have no learning better than the simple guessing of the mean of the data.  When less than one, the prediction is more informative than just the mean.  My question is: what is this measure commonly called? Uncoolbob 21:05, 15 January 2007 (UTC)
replies: text: It is certainly wide enough in my field (Bioinformatics) to be useful and pertinent. The is a lot more to the story of "RMSD" than we have in this article. It could also use a lot more math theory. I also have a programme I wrote in C for calculating RMSD (it is impressively fast) and will upload the code to this site soon.--Thorwald 01:52, 17 January 2007 (UTC)

text: *See Mean squared error#Interpretation.  Yet another reason these articles should be merged.  -- DanielPenfield (talk) 03:16, 3 February 2010 (UTC)
thread_title: 2007 unnamed discussion

message: The formula in this article defined residuals as the predicted value minus the observed value. I am not an expert and have been looking for verification of that definition. Different articles define residuals as observed minus predicted. There seems to be consensus that the latter definition is 'correct', or at least, accepted in a scientific context. Here is a great discussion: https://stats.stackexchange.com/questions/342466/are-residuals-predicted-minus-actual-or-actual-minus-predicted
Perhaps this article could include both definitions, and explain how each is used? 130.195.253.47 (talk) 00:45, 14 September 2023 (UTC)
replies: text: In the context of this article the difference is squared, so it does not matter which way you subtract. Retimuko (talk) 02:52, 14 September 2023 (UTC)
replies: text: Hi Retimuko, don't you think it matters in terms of developing understanding? Statistical terms, what statistics represent, and how different statistics relate to each other? 130.195.253.61 (talk) 02:15, 15 September 2023 (UTC)
thread_title:  Observed minus predicted versus predicted minus observed 

message: It seems that there is an ambiguity on whether the article is about (1) the RMSE of an estimator, which is an expected value and thus a fixed number or (2) the RMSE of a particular sample (which is a random number in the sense that it depends upon the actual sample obtained). I made light edits to the lede and the structure to clarify this ambiguity, but believe that the issue should be checked more thoroughly.
I looked in Rice (1995), and he defines MSE in the former sense, while he appears to say nothing about the latter sense. However, except for one formula, this article presently appears to be focused on the latter concept. –St.nerol (talk) 15:34, 26 September 2023 (UTC)
thread_title:  RMSE for sample or for estimator 

message: Errors and residuals are observed values minus predicted ones. In the equation for regression RMSD it looks like they're swapped. Am I reading it incorrectly? For this particular equation, it doesn't matter the order because it's squared, but an error is what an error is, and it should be written correctly, because they don't always get squared. 128.174.75.191 (talk) 21:57, 21 December 2023 (UTC)
thread_title:  Are the terms in the regression equation correct? 

message: :The following is a closed discussion of a requested move. Please do not modify it. Subsequent comments should be made in a new section on the talk page. Editors desiring to contest the closing decision should consider a move review after discussing it on the closer's talk page. No further edits should be made to this discussion.
The result of the move request was: moved. (non-admin closure) Safari ScribeEdits! Talk! 15:51, 3 May 2024 (UTC)
replies: text: Root-mean-square deviation →  – The hyphenation in the title appears non-standard. Of the accessible citations, all seem to use no hyphenation. Engineerchange (talk) 16:59, 26 April 2024 (UTC)

text: Note that root mean square also doesn't have hyphens. --Engineerchange (talk) 17:09, 26 April 2024 (UTC)

text: Support.  Technically the hyphenated version is more correct in terms of punctuation, but it seems pretty clear by Google ngrams that that spelling is falling out of favour (see here). Though, I do note that even a cursory Google search and search via Google Scholar shows the hyphenated spelling is still used often enough.  ― Synpath 18:02, 27 April 2024 (UTC)
thread_title:  Requested move 26 April 2024