Question

Can someone please explain. like what are those letters under the numbers, is that what they equal? I'm just starting this today please help.
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Answer 1

Answer: R-squared (R2) is a statistical measure that represents the proportion of the variance for a dependent variable that's explained by an independent variable or variables in a regression model. ... So, if the R2 of a model is 0.50, then approximately half of the observed variation can be explained by the model's inputs.

Answer 2

Answer:

Those are called subscripts, the little numbers on the bottom right.