I think this means the fraction of all true occurrences, where y-hat and y are equal, but I am unfamiliar with the last term. Can someone give the proper terminology to describe this and a reference for learning more advanced sigma notations?
How do I read this this sigma notation?
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$\mathbf 1(\hat{y_i}=y_i)$ is an indicator function; a piecewise function that has a value of 1 when the argument, $\hat{y_i}=y_i$, is true, and a value of 0 when it is false.
$$\mathbf 1(\hat{y_i}=y_i)~=~\begin{cases} 1 &:&\hat{y_i}=y_i\\[1ex]0&:& \text{otherwise}\end{cases}$$
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0Thank you very much. Without a math background, I'm unsure how I would learn this. Do you know of references for learning things like indicator functions? – 2017-01-18