According to the Wikipedia page for "Cross Validation" :

Cross-validation, sometimes called rotation estimation or out-of-sample testing, is any of various similar model validation techniques for assessing how the results of a statistical analysis will generalize to an independent data set. It is mainly used in settings where the goal is prediction, and one wants to estimate how accurately a predictive model will perform in practice. In a prediction problem, a model is usually given a dataset of known data on which training is run (training dataset), and a dataset of unknown data (or first seen data) against which the model is tested (called the validation dataset or testing set). The goal of cross-validation is to test the model's ability to predict new data that was not used in estimating it, in order to flag problems like overfitting or selection bias and to give an insight on how the model will generalize to an independent dataset (i.e., an unknown dataset, for instance from a real problem).

Clearly, Cross Validation is a statistical technique which is used to infer something about some data. As far as I know, there are thousands of such techniques or approaches which we use for solving different kind of problems relevant to statistics. Then, why is stats.stackexhange.com is called Cross Validated ? Shouldn't it be called something like Statistics Stack Exchange, just like the Mathematics one ?

I'm sorry if my question is silly, or had been answered previously. Thank you.

  • 1
    $\begingroup$ Here's how I interpret the name: You come here to validate your understanding of statistics through other statisticians. We cross link to other posts to build a network of improved understanding for future visitors of the site. It is vaguely, if at all related to the statistical concept of cross validated, but the goal is analogous. I see it as how a layman would interpret what crossvalidation might be. $\endgroup$ Commented Nov 16, 2020 at 23:05
  • $\begingroup$ Yeah cool. But that's true for any Stack Exchange site. Most of us come here, be it Math, Stat or CS, in order to validate our understanding of the subjects. So, by that logic, any of the networks could be named "Cross Validated". :P $\endgroup$
    – JRC
    Commented Nov 17, 2020 at 4:44
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    $\begingroup$ Crossvalidation is a statistical technique. It wouldn't be a play on words for any of the other sites. $\endgroup$ Commented Nov 17, 2020 at 7:14

1 Answer 1


Ten years ago, it was a custom that every site got its own name (i.e. Stack Overflow, Super User, Server Fault), not just [topic] Stack Exchange. There was a community poll (sadly, the results are no longer visible) and Cross Validated was the winner.

  • $\begingroup$ I went through the link which you shared. Is it true that name "Statistics Stack Exchange" was never proposed for this site ? If so, I must say that I'll be quite surprised. $\endgroup$
    – JRC
    Commented Nov 16, 2020 at 9:25

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