Can you find any pattern in the two signals, green and blue? The blue signal is the brain wave (measured by NIRS) of a person when he is pressing some buttons (the timing of button pressing is shown i
Wavelet transform coherence (WTC) is a method for analyzing the coherence and phase lag between two time series as a function of both time and frequency (Chang and Glover 2010). Here I played with it
SVM is mostly commonly used for binary classifications. But one branch of SVM, SVM regression or SVR, is able to fit a continuous function to data. This is particularly useful when the predicted varia
Update 2021/2/27: If you find griddata3 not working, try to change griddata3 to griddata. I was asked where to get nirs2img script. Here it is. The download link is at the bottom of this article. nirs2img is to create an image file from the input data. Then theimage file can be viewed by a
The default format of output in MatLab is like below: v = 1.0e+003 * 9.0579 1.2699 9.1338 6.3236 0.9754 What if you want the format to be v = 9057.9 1269.9 9133.8 6323.6 975.4 The answer is simple. Run the following command in MatLab: format shortg
The statistics toolbox in MatLab provides an easy way to do 1-way and 2-way anova. Below are some examples. The functions are called anova1 and anovan. 1 way anova is to test if the mean in each group is same; and 2-way anova is to test (1) if the me
One particular nice thing about SVR is that the weight of each feature reflects the feature’s true contribution. If some features are highly correlated (this is common in neuroimaging data – e.g. adjacent voxel activity are very similar),
