Xu Cui
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566 Stories by Xu Cui
离家不远处有一条静静的小河 闲暇时我和孩子总有一段时光在那儿度过 清清的河水静静地流淌 只偶有几头到河边吃草的老牛慢慢走过 柔顺飘逸的苔丝和水草为小河装点了绿意 一群群小鱼在上面散步跳舞唱歌 思绪像随
Standard deviation (std): standard deviation of the sample Standard error, or standard error of the mean (sem), is the standard deviation of the mean. \(sem=std/\sqrt{N}\) Most errorbars in scientific publications refer to standard error. Quite often
David is an amazing person: he has published 5 papers in Nature and 1 in Science, two of which were published this year. Check out what he says in Peaya interview (click the photo below).
I noticed that gmail will remind you if you have something like “… is attached” in the email body but actually you don’t attach any files. This is very considerate.
If variable X and Y has correlation 0.1, how much does it help to predict Y based on X? In the simplest binary case, the probability (p) to correctly predict Y based on X is a linear function of correlation (c), i.e. $$p=\frac{c+1}{2}$$ That means, a
Null hypothesis (H0): Octopus Paul doesn’t have the ability to predict. Or, the probability that he predicts correctly on each event is 1/2. Data: In 2010 World Cup, Octopus Paul correctly predicted the outcomes of 8 games out of 8 games. p-Val
The goal of Peaya is to make your academic life more fun and more productive. Peaya Comics Comic strips about our academia life – the excitement, joy, depression, and pain. We hope the strips will make you smile. Below is the latest comics: Peaya P
Tools: SPM, cor2mni Assume the image is “a.img”, do v = spm_vol('a.img'); v.mat If v.mat is a diagonal matrix, you can simply read the number and they are the voxel size in mm. If not, a trick is to calculate the distance between adjacent
Here are some parameters in matlab lighting. I first use patch command to plot the surface, then use camlight to shed some light on the surface.