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期末复习--实用回归分析 \[ y=\left[\begin{array}{c} y_{1} \\ y_{2} \\ \vdots \\ y_{n} \end{array}\right], X=\left[\begin{array}{cccc} 1 & x_{11} & \cdots & x_{1 阅读全文
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一元线性回归 \[ y=a+b x+\epsilon \] \[ \begin{aligned} Q \equiv Q(a, b) &=\sum_{i=1}^{n} e_{i}^{2} \\ &=\sum_{t=1}^{n}\left(y_{i}-\hat{y}_{i}\right)^{2} \\ 阅读全文
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\(f(x)=a_{0}+a_{1} x+\cdots+a_{n-1} x^{n-1}+a_{n} x^{n}\) input:i,\(x_i\),a[\(\dots\)]--List a=[3,43,54,22] def func(x): for m in range(0,3): p=a[m]*x 阅读全文
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In the past,I try to install oh my zsh in my wsl(windows sub-linux) sh -c "$(curl -fsSL https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh 阅读全文
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Branching and iteration Strings concatenate the strings hi = "hellothere" name = "ana" oscar = hi + name print(oscar) ppi = hi+" "+name print(ppi) hel 阅读全文
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omxplayer sudo apt-get install omxplayer wget到github极其容易断开...对体验极其不好... 建议直接apt,国内清华源正好支持 cd /media/pi/oscarli/1-4.1080p omxplayer -o hdmi 3.mkv 阅读全文
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Set \(\rightarrow\) Space (metrix$\leftrightarrow$map) Exa: 1.\(\rho(x,y)=x+y\)? (x)三角不等式:\(\rho(x, z) \leq \rho(x, y)+\rho(y,z)\) 2.\(\rho(x,y)=x \ti 阅读全文
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取阈值:首先进行回归分析,然后得到的参数,进行排序,根据极端冲击,负极端取0.1,正极端取0.9,作为相应变量的阈值 10个类别(9个是积极,正常,消极的组合,剩下一个是传统格兰特方法) {shockprc:分类} $$\begin \left(X_{+}, Y_{+}\right),\left(X 阅读全文
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$$1+2 z+3 z^{2}+\cdots+n z^=0$$ 在$B\left(0,r\right)$ \(\int_{-\infty}^{+\infty} \frac{P(x)}{Q(x)} \mathrm{d} x=2 \pi \mathrm{i} \sum_{j=1}^{n} \operat 阅读全文
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HW1 已知下述三种 10 年期债券的面值均为 1000 元,每年末支付一次利息,到期收益率相同 债券 A :年息票率为 4%,折价发行,折价 10 元; 债券 B :年息票率为 5%,溢价发行,溢价 X 元; 债券 C :年息票率为 6%,溢价发行,溢价 20 元 计算 X 的值 $$\begin 阅读全文