Source: Mostly from wiki. Heart rate variability (HRV,心率变异性) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. Other terms used include: "cycle length v…

DFA(Detrend Fluctuation Analysis)与scale-free scale-free的本质特征是self-affine or self-similar.具体的,体现在几何上,那么图形中总能找到一个小的部分,它的形态与总的图形一致或相似,体现在统计上,则某一小段序列的标准差不依赖于尺度的选择,它能够通过rescale得到和总体标准差一样的值,或者说其标准差和尺度的关系满足幂律指数关系,这意味着在双对数坐标系下,二者的图线是一条直线. scale-free的一种通用数学定义…

Python分析离散心率信号(中) 一些理论和背景 心率信号不仅包含有关心脏的信息,还包含有关呼吸,短期血压调节,体温调节和荷尔蒙血压调节(长期)的信息.也(尽管不总是始终如一)与精神努力相关联,这并不奇怪,因为大脑是一个非常饥饿的器官,因此消耗了总葡萄糖的25%和氧气消耗的20%.如果活动增加,心脏需要更加努力地工作以保持其供应. 感兴趣的是这些措施可以被分为时间序列数据连接频域数据.如果熟悉傅立叶变换,则频率部分会很有意义.如果不是,请参阅维基百科页面具有很好的解释,并且对过程也非常直观.基…

Techniques are presented that include determining, for data to be written to a nonvolatile memory, a location in the nonvolatile memory to which the data should be written based at least on one or more wear metrics corresponding to the location. The…

http://www.howtogeek.com/177790/why-you-cant-use-cpu-clock-speed-to-compare-computer-performance/ Why You Can't Use CPU Clock Speed to Compare Computer Performance Shopping for a new computer? Don't pay too much attention to CPU clock speed. "CPU spe…

https://en.wikipedia.org/wiki/Clock_rate The clock rate typically refers to the frequency at which a chip like a central processing unit (CPU), one core of a multi-core processor, is running and is used as an indicator of the processor's speed. It is…

这篇博客很全面 http://www.cnblogs.com/cdeng/p/3471527.html ROC曲线 1.混淆矩阵(confusion matrix) 针对预测值和真实值之间的关系,我们可以将样本分为四个部分,分别是: 真正例(True Positive,TP):预测值和真实值都为1 假正例(False Positive,FP):预测值为1,真实值为0 真负例(True Negative,TN):预测值与真实值都为0 假负例(False Negative,FN):预测值为0,真实值…

Detailed Description Heart Rate Service module. This module implements the Heart Rate Service with the Heart Rate Measurement, Body Sensor Location and Heart Rate Control Point characteristics. During initialization it adds the Heart Rate Service and…

[转载请注明出处]http://www.cnblogs.com/mashiqi Today let's talk about a intuitive explanation of Benjamini-Hochberg Procedure. My teacher Can told me this explanation. Suppose there are $M$ hypothesis:$$H_1,H_2,\cdots,H_M$$and corresponding $M$ p-values:$$p…

从TP.FP.TN.FN到ROC曲线.miss rate.行人检测评估 想要在行人检测的evaluation阶段要计算miss rate,就要从True Positive Rate讲起:miss rate = 1 - true positive rate true positive rate毕竟是一个rate,是一个比值.是谁和谁比呢?P 要从TP.FP.TN.FN讲起. 考虑一个二分类问题:一个item,它实际值有0.1两种取值,即负例.正例:而二分类算法预测出来的结果,也只有0.1两种取值,…