Cross Validated
Mark L. Stone's user avatar
Mark L. Stone's user avatar
Mark L. Stone's user avatar
Mark L. Stone
  • Member for 8 years, 6 months
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266 Answers

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3 votes

What is the hazard-rate of a truncated probability distribution?

3 votes

Covariance of an estimate from optimization

3 votes

Quadratic problems with norm constraints in R

3 votes

How to recover primal problem from its dual counterpart

2 votes
Accepted

Why weights are not negative in Lasso regression?

0 votes

If $X$ is normally distributed, can $\log(X)$ also be normally distributed?

1 vote
Accepted

Why may a matrix be singular or ill-conditioned with standard learning algorithm for linear classification?

8 votes
Accepted

Computing Highest Density Region given multivariate normal distribution with dimension $d$ > 3

7 votes
Accepted

Why is gradient descent with momentum considered an exponentially weighted average?

3 votes

Is it possible to calculate the probability the sum of one set of random variables equals the sum of a different set of random variables?

2 votes

The lack of correlation determines the second-degree cross-moments (covariances) of a multivariate distribution?

1 vote

Estimation of parameters from two simultaneous equations

1 vote

Hessian of Log of Matrix-t distribution

2 votes
Accepted

formula for sample covariance: Bessel's correction

9 votes
Accepted

Any optimization problem can be expressed as one with a linear objective

7 votes
Accepted

Working out error on fit parameters for nonlinear fit

1 vote

Negative variances in Kalman smoother (FFBS)

5 votes

What is the use of the log of the sum of exponents in machine learning

5 votes
Accepted

Constrained Multivariate regression in R

4 votes
Accepted

Variance of the reciprocal of a strictly positive random variable

2 votes

Are random variables generated or are random variates generated?

1 vote
Accepted

What does the matrix $M = [diag(m_{:,1}),\ldots,diag(m_{:,m})]$ look like?

1 vote

What is the distance between a finite Gaussian mixture and a Gaussian?

1 vote
Accepted

Conditional Probability Distribution of Multivariate Gaussian

3 votes
Accepted

Probability of getting imaginary roots

2 votes

BFGS memory problem

2 votes
Accepted

Checking positive definiteness

4 votes

Do optimization problems written in argmax form represent a function?

1 vote

Is MATLAB's fmincon fast compared to other languages such as C++ for multivariate Gaussian models?

25 votes
Accepted

Why not use the "normal equations" to find simple least squares coefficients?

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