Posts
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Free Water and MRI Part 1 [
MRI Writing in progress…
Magnetic resonance imaging (MRI) is a medical imaging technique which uses magnetic fields to look at organs in a living body. This post describes the math behind a particular MRI imaging technique called Diffusion Tensor Imaging (DTI). DTI is used to map the structure of the brain by measuring how restricted the water molecules are in their local environment. It is a clever technique as it relies on taking a bunch of overexposed images from many different directions and then using a statistical model to try and recover what the water molecules are doing. If we can figure out how the water molecules move, we get an idea of the local environment that the water molecules are in and thus build a map of the brain.
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Analyzing Developmental Trajectories [
unsupervised-learning R expectation-maximization clustering A developmental trajectory describes the course of a behavior over age or time. Daniel Nagin pioneered a method called
Group-based Trajectory Modelingtoclusterthese trajectories into groups. Link. This method is quite popular in the medical and social sciences. In this post I will take a look at his paper from 1999 - Analyzing Developmental Trajectories - A Semiparametric Group-based approach and provide some code inRto work through the datasets. -
Getting R markdown to play with jekyll [
R blog This post is an attempt to get R Markdown to render on a
jekyllwebsite. The prolific Yihui Xie has a github repository yihui/blogdown to demonstrate how to do this usingblogdownandknitr. There is also some documentation available. Jekyll isn’t well supported by blogdown so I needed to hack a few things together to get them to work well. -
Setting up my Blog! [
blog I’m trying to setup a blog with with many moving parts :
jekyll,blogdown,mathjax,R,python,jupyter,github-pages. I’m optimistic that if I keep it simple they will all play well together. Time will tell..
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