Jun 22, 2013 — Diffusion Tensor Imaging (DTI) — Diffusion Tensor Imaging looks at white matter integrity.  It is a MRI based method that uses diffusion properties of water molecules to construct white matter fibers (anatomical connections) between brain regions.  There are many metrics of white matter tracts you... Read more

Jun 22, 2013 — K-Means Clustering — K-Means clustering is a bread and butter method of unsupervised clustering in machine learning, and I love it because it’s so intuiitive, and possibly because I learned about it in one of my favorite classes at Stanford, BMI 214 with... Read more

Jun 20, 2013 — Logistic Regression — Logistic Regression is a supervised learning method for predicting a discrete outcome (y) based on one or more features (x).  If you remember in linear regression we were trying to predict a continuous variable, and in logistic regression we are... Read more

Jun 19, 2013 — Locally Weighted Linear Regression — Let’s say that we have some relationship between our outcome variable (y) and one or more predictors (x) that isn’t cleanly linear, quadratic, or even cubic.  Let’s say that this relationship looks like a squiggle of pasta, and we might... Read more