How to calculate a var of the sum of two coefficients in linear regression
92725
Closed form for the variance of a sum of two estimates in logistic regression?
79573
linear combination and univariate normal
148798
Closed form and gradient calculation for linear regression
9356
Derivation of the formula for Ordinary Least Squares Linear Regression
116369
What is the variance of Y = AX where A is a matrix?
33843
Assumption Of Linear Regression
41256
Variance of a linear combination of vectors
158072
Variance of Gaussian linear combination
81757
How to include a linear and quadratic term when also including interaction with those variables?
83058
Finding $\mathrm{Var}(N)$ if $N=\inf\{n\ge1:\sum_{i=1}^nX_i>1\}$ where $X_i$'s are i.i.d Exponential variables
27054
Sum of squares of residuals instead of sum of residuals
141134
How to calculate weighted covariance?
5136
How to sum a variable by group
130496
How do I fit a constrained regression in R so that coefficients total = 1?
59398
Inverting logarithmic output from VAR model
52796
Converting the beta coefficient from matrix to scalar notation in OLS regression
133729
Sum of normal independent random variables with coefficients