https://darkpgmr.tistory.com/147

A regression model containing Fourier terms is often called a harmonic regression because the successive Fourier terms represent harmonics of the first two Fourier terms.

A test for a group of autocorrelations is called a portmanteau test, from a French word describing a suitcase containing a number of items.

One such test is the Box-Pierce test, based on the following statistic$$Q=T\sum _{k=1}^h{r}_k^2,$$where $h$ is the maximum lag being considered and $T$ is the number of observations. If each $r_k$ is close to zero, then $Q$ will be small. If some $r_k$values are large (positive or negative), then $Q$ will be large. We suggest using $h=10$ for non-seasonal data and $h=2m$ for seasonal data, where $m$ is the period of seasonality. However, the test is not good when $h$ is large, so if these values are larger than $T/5$, then use $h=T/5$

A related (and more accurate) test is the Ljung-Box test, based on$$Q^{\ast }=T(T+2)\sum _{k=1}^h(T-k{)}^{-1}{r}_k^2.$$

Again, large values of $Q^{\ast }$ suggest that the autocorrelations do not come from a white noise series.

fetch_openml 이 scikit-learn 의 최신버전(0.20.x)에만 있는 것 같습니다.

phi1 <- seq(-3,3,0.1)

phi2<-seq(-3,3,0.1)

phi <- merge(phi1,phi2)

flag<-rep(0,3721)

for(i in 1:3721){

z=polyroot(c(1, -phi$x[i],-phi$y[i]))

az=abs(z)

flag[i]=ifelse((az[1]>1 & az[2]>1),1,0)

c<-cbind(phi,flag)

plot(c$x,c$y,col=c$flag)

access denied for user 'root'@'localhost' (using password yes)

메세지에 대한 해결방안

MYSQL Command Line Client 창을 열어

sudo mysql

ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'root';

치면 비밀번호 root로 접속 가능하다