Recent questions in Inferential Statistics

Regression
Answered

Kendall Oneill
2022-05-08

Regression
Answered

Carley Haley
2022-05-08

In Ridge regression, we have $\theta ={(\lambda I+{X}^{T}X)}^{-1}{X}^{T}y$.

I learnt somewhere that while ${X}^{T}X$ is not guaranteed to be invertible, $\lambda I+{X}^{T}X$ is guaranteed to be invertible.

Is this true? If so, why?

Regression
Answered

Porter Mccullough
2022-05-03

$\begin{array}{cccccc}x& 1& 2& 3& 4& 5\\ y& 3& 6& 8& 9& 0\\ y& 4& 6& 1& 2& 4\end{array}$

and know that it is a simple linear regression model, what is the value of $n$? I think it is either $5$ or $10$ but am not sure which one.

Correlation
Answered

juniorychichoa70
2022-05-02

Correlation
Answered

znacimavjo
2022-05-01

$\mathrm{\infty}>\sum _{i}|{a}_{i}{|}^{2}\ge \sum _{i}|{b}_{i}{|}^{2}.$

Suppose moreover they are uncorrelated over any time delay, meaning

$\sum _{i}{a}_{i}\overline{{b}_{i-n}}=0\phantom{\rule{1em}{0ex}}\mathrm{\forall}n\in \mathbb{Z}.$

Is it true that the polinomial $a(z)=\sum _{i}{a}_{i}{z}^{-i}$ is greater in absolute value than $b(z)=\sum _{i}{b}_{i}{z}^{-i}$ for any unit norm complex number z?

Correlation
Answered

gaitaprepeted05u
2022-04-30

$f(x,y)=\{\begin{array}{ll}2& 0<x\le y<1\\ 0& ioc\end{array}$

Calculate the correlation coefficient between X and Y.

Regression
Answered

ga2t1a2dan1oj
2022-04-07

In simple terms, inferential statistics is an approach where you use measurements from the sample of specific subjects as you conduct an experiment. The purpose is to make an outcome based on generalization regarding the greater population of subjects. You may use equations if there are questions that are related to a particular approach. You can get inferential statistics help as we provide a list of answers with good samples to start with. There are related topics like correlation problems that will help you with financial statistics and the coordination of variables. You may also focus on the