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Cross Validated : Recent Questions and Answers (Page 13)

Find answers to your questions about Cross Validated or help others by answering their Cross Validated questions.

How to interpret "quantile residuals"

The DHARMa package in R aims to provide scaled (quantile) residuals that, according to the DHARMa vignette, "can be interpreted as intuitively as residuals from a linear...

Asked on 12/20/2021

1 answer

Is the regressor (sometimes called "independent" variable) actually independent of the response from a probabilistic perspective?

In supervised learning, we refer to the regressors as independent variables and response variables as dependent, but from a probabilistic standpoint, I am having trouble understanding this. To breakdown my...

Asked on 12/20/2021 by 24n8

1 answer

Laplace approximation in high-dimensions

Obviously computing the inverse Hessian is hard when a probability distribution is fitted on high-dimensional datapoints. One idea to reduce computational cost would be to approximate the distribution with a...

Asked on 12/20/2021 by Dionysis M

2 answer

Extremely basic question: how are data assumed to be generated in machine learning?

Given a dataset $mathcal{D} = {x_i}, i = 1, ldots, N, x_i in mathbb{R}$ In machine learning, what assumption is made as to how data are generated? I've seen...

Asked on 12/20/2021 by Fraïssé

0 answer

Is it appropriated to use an 'Invariant' variable in multivariate test?

I have been assigned the task of finding out how (and if) the biological diversity of tropical insects (ants) is related to environmental variables. So I did a small field...

Asked on 12/20/2021 by terauser

0 answer

Equation for weighted average with normalization(?)

I am trying to understand how I should denote the equation for rescaling the following 7 categories into one value. The final weighted average is 0.57, which is possible by...

Asked on 12/20/2021

0 answer

guessing a number between 1 and 100

Person A chooses an integer between 1 and 100 at random, then B can guess that number in (at most) 7 attempts, i.e. $log_2(100)+1=7$. What if now A chooses...

Asked on 12/20/2021 by dynamic89

1 answer

Normalizing posterior distribution

This is from task 5.3. in Bayesian Data Analysis 3rd edition by Gelman et al. It deals with a hierarchical model where I am supposed to simulate the posterior distribution...

Asked on 12/20/2021

1 answer

chi squared test in python libraries

As I understand it, statsmodels.stats.contingency_tables.Table.test_nominal_association() and scipy.stats.chi2_contingency() refer to the same test, however the results are different:import numpy as np### Contingency tabletab = np.array([[6,20],[13,5]])### SciPyfrom scipy.stats import chi2_contingencychi_val,p_val,dof,exp_val=chi2_contingency(tab)print("Chi...

Asked on 12/20/2021 by eurohacker

1 answer

Structural break test for non-stationary time series

I recently found out that Bai and Perron test for identifying structural breaks using the package strucchange can't be used in case time series is non stationary. Is anyone aware...

Asked on 12/20/2021

0 answer

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