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The error of an estimate or prediction is its deviation from the true value, which may be unobservable (e.g., regression parameters), or observable (e.g., future realizations). Use the [error-message] tag to ask about software errors.

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What is the relationship between mean squared error and classification error?

If I use MSE as my fitness function, over time MSE decreases and classification error decreases. Looking at my plots, it looks like MSE and CErr are directly related. … Accuracy is just a function of classification error (1 - CErr = Acc). From this I can deduce a lower MSE means a lower CErr but a lower CErr doesn't always mean a lower MSE. …
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