Why can $R^2$ be negative in a multiple regression that doesn't have an intercept ($\hat{\beta}_0 = 0$)?
55479
Negative R squared contradicts ssa/sst?
58659
Confused about 0 intercept in logistic regression in R
51668
Is the model wrong if a coefficient changes from minus in correlation table to plus in OLS?
19831
How to get the degree of freedom when doing multiple linear regression?
90302
How do we interpret the results of regression for log transformed data containing negative values, $\log(Y-\min(Y)+1)$?
23128
Why aren't logarithms defined for negative $x$?
7970
Why does the product of the bivariate regression coefficients of the $y$-on-$x$ line and $x$-on-$y$ line equal the square of the correlation?
41983
What happens when I include a squared variable in my regression?
151995
Why are effect size estimates (such as $R^2$) difficult in mixed-effects models?
29875
Why not using the R squared to measure forecast accuracy?
97269
Non-significant intercept in regression with a two level factor in R
98605
Ridge/Lasso regression negative Lambda
128756
How to interpret regression coefficients when outcome variable was transformed to $1 / \sqrt{Y}$?
126294
In multiple regression, why are interactions modelled as products, and not something else, of the predictors?
2898
What's the MSE of $\hat{Y}$ in ordinary least squares using bias-variance decomposition?
3998
Magnitude of standardized coefficients (beta) in multiple linear regression
53729
Regression Interpretation Intercept