$R^2$ equals square of correlation between observed and fitted responses
107573
Does the slope of a regression between observed and predicted values always equal the $R^2$ of the original model?
64070
sample space and observational units
48916
Determing two Nonlinear model fits with 95% confidence bands from one data set
83292
Manually calculated $R^2$ doesn't match up with randomForest() $R^2$ for testing new data
9356
Derivation of the formula for Ordinary Least Squares Linear Regression
124337
Degrees of freedom in regression
41983
What happens when I include a squared variable in my regression?
69828
How do I use the standard regression assumptions to prove that $\hat{\sigma}^2$ is an unbiased estimator of $\sigma^2$?
91668
Sign of Estimate (Coefficient) of Interaction Terms
111749
Mean and variance of Squared Gaussian: $Y=X^2$ where: $X\sim\mathcal{N}(0,\sigma^2)$?
10730
Proof that regression residual error is an unbiased estimate of error variance
120925
Linear regression with strongly non-normal response variable
36464
How to interpret coefficients from a polynomial model fit?
147938
MAPE vs R-squared in regression models
138325
Equivalence of two formulas for variance and covariance
116608
Finding a polynomial fit to a set of data
85486
Show that $S = \sqrt{S^2}$ is a biased estimator of $\sigma$ given a random sample from a normal distribution ...