Jun 16, 2013 — Partial Volume Effect — Partial Volume Effect in medical imaging speaks to the idea that we may not detect signal in small volumes or regions when our resolution is limited.  If you are a researcher that is totally crazy about the amygdala, for example,... Read more

Jun 16, 2013 — Cross Validation — In a perfect world, we would be able to ask any question that our little hearts desire, and then have available immediately infinite numbers of datasets to test our hypothesis on, and know exactly the model and parameters to use.... Read more

Jun 15, 2013 — Independent Component Analysis (ICA) — I’m sure that you’ve heard of the cocktail party problem. The simplest version of the problem posits that you have two people talking in a room with two microphones, each recording a mixed signal of the two voices. The challenge... Read more

Jun 14, 2013 — Bias and Variance Tradeoff — When we talk about bias vs. variance tradeoff, we are venturing into the field of learning theory that broadly thinks about how to best match particular data to a method, and how to improve performance of a model by understanding... Read more