Friday, May 12, 2023

The difference between a partial and total derivative

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Imagine that the price of a can of baked beans is a function of two variables, the cost of beans and the cost of hiring workers for canning ...
Monday, July 22, 2019

What is a Boltzmann brain?

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The second law of thermodynamics states that the entropy or disorder of a system always increases over time. A hot cup of tea, for example,...
Sunday, April 28, 2019

Gelman & Rubin convergence criteria for MCMC

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A Monte Carlo Markov Chain (MCMC) is a very popular method to obtain the likelihood for a large parameter space and often it is the only com...
Monday, October 22, 2018

Shrinkage estimators for stable covariance matrices

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Obtaining reliable error bars is often the most difficult aspect of a data analysis project. In cosmology, we usually derive a covariance ma...
Monday, April 30, 2018

Jacobian transformation and uniform priors in Bayesian inference

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This blog post describes the Jacobian transformation and how a uniform prior on a parameter can turn into a non-uniform prior for related ...
Saturday, March 31, 2018

About the assumption of a Gaussian likelihood in a data model comparison

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This is a blog post about a recent publication led by ChangHoon Hahn , which I co-authored ( Hahn et al. 2018 ). The paper looks at the impa...
Thursday, March 29, 2018

Measuring Neutrinos with the distribution of galaxies in the Universe

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In this blog post, I will summarise the paper Baumann et al. (2018) which my collaborators and I just published. The paper reports a measur...