Cross Validated Questions, Problems & Solutions : TransWikia.com ~ Page 7

Prediction Intervals (Conformal Predictions) for Regression Problems

So I've been looking into the idea of looking into conformal predictions, or to obtain prediction intervals instead of just single point predictions. Basically my take is that I would...

Asked on 12/29/2021 by bioinformatics_student

0 answer

Why not use % change in regression instead of log diff?

Given that log difference = percent change why not make the series stationary by just using percent change as the regresor. a. It's not an approximation and we can interpret...

Asked on 12/29/2021 by tjaqu787

0 answer

Estimating expected values for correlated data using random effects models

Statement of the problem: in a study, continuous and dichotomous variables were measured for both eyes for 60 individuals. The researchers needs estimates of expected values (means and proportions) for...

Asked on 12/29/2021 by Nicolas Molano

4 answer

Should multiple testing correct with bonferroni ever reduce a p value's size?

I just did a series of 40 t-tests and then proceeded to use bonferroni correction for multiple testing and my P values reduced in size. Why does this happen? I...

Asked on 12/29/2021

1 answer

Compute Mean of a Clipped Normal Distribution

I am trying to solve this problem and have solved all parts except for the last part. I have tried to...

Asked on 12/29/2021 by Ahsan

2 answer

What is an example of perfect multicollinearity?

What is an example of perfect collinearity in terms of the design matrix $X$? I would like an example where $hat beta = (X'X)^{-1}X'Y$ can't be estimated because $(X'X)$...

Asked on 12/27/2021 by TsTeaTime

3 answer

Should I use a seasonal arima or stl decomposition and model residuals only?

I have a basic question in time series modeling. (using r but the question is not particularly about r) For a time series with obvious seasonality, shall I use ...

Asked on 12/27/2021 by string_is_hard

1 answer

Endogenous controls in linear regression - Alternative approach?

I have a cross-section of $x$, $y_1$, and $y_2$. These are individual level data used in labor economics. I have random variation in $x$ and I'm...

Asked on 12/27/2021 by sgtbp

2 answer

Variable selection in logistic regression model

I'm working on a logistic regression model, I have 417 independent variables to try, but running a model with all of them is too much (for Rstudio), what would be...

Asked on 12/27/2021

3 answer

EM Algorithm Derivation, Discrete Case

Just wanted to ask whether the following derivation is correct: Suppose $X$ is a vector of observed random variables, $Z$ is a vector of unobserved random variables and...

Asked on 12/27/2021

1 answer

Ask a Question

Get help from others!

Cross Validated : Recent Questions and Answers (Page 7)

Ask a Question