AdaBoost, Adaptive boosting

AdaBoost is an algorithm to linearly combine many classifiers and form a much better classifier. It has been widely used in computer vision (e.g....
Xu Cui
51 sec read

Distribution of correlation coefficient (r)

Assume you got correlation r=0.6 between two variables (N=10), is 0.6 significantly bigger than 0? Or if you observed r=0.98, is it significantly different...
Xu Cui
38 sec read

Using matlab to control LPT port

Download the following 4 files: porttalk.sys, copy to C:\WINDOWS\system32\drivers lptread.m lptread.mexw32 lptwrite.mexw32 Copy the last three files to a directory where your matlab can...
Xu Cui
28 sec read

batch script for NIRS-SPM

I wrote some batch scripts for NIRS-SPM. They, together with NIRS-SPM and xTopo, are called “super” package (I apparently run out of names). The...
Xu Cui
1 min read

Retinotopy analysis with MrVista

This protocol is based on Rory Sayres‘ teaching. Download and install MrVista svn checkout If you already downloaded an older version,...
Xu Cui
5 min read

Analyze NIRS data with NIRS-SPM

being updated for v01_r14 … NIRS-SPM is a SPM5 and MATLAB-based software package for statistical analysis of near-infrared spectroscopy (NIRS) signals, developed at the...
Xu Cui
4 min read

non-blocking pause

Assume you have a presentation and you want it to stay on the screen for 10 seconds, you may write code something like pause(10)...
Xu Cui
19 sec read

Stanford NIRS lab

Check out Near infrared spectroscopy (NIRS) Lab I take charge of: NIRS allows you to measure neural activities on the surface of the...
Xu Cui
11 sec read

Kolmogorov-Smirnov test

KS test is like T test; but it tests not only the mean but also the distribution. The null hypothesis for this test is...
Xu Cui
27 sec read

fMRI: how to do ROI analysis

ROI stands for region of interest. The region is predefined usually from glm contrast. For example, you find visual cortex is activated when a...
Xu Cui
42 sec read