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Cross Validated : Recent Questions and Answers (Page 56)

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

What model to use for analyzing age frequency data? issues with linear model in R

I have this data in R and I'm trying to statistically analyze whether high age zeros (column n) in each year is significantly correlated to the next years age 1...

Asked on 02/16/2021 by Johnny5ish

1 answer

Dimensionality reduction of a large covariance matrix

I have a large covariance matrix $Sigma$ and I am reducing its dimensionality by using a truncated eigendecomposition. $Sigma approx VDV^T$. I remember somewhere that you could also...

Asked on 02/15/2021 by Wilmer E. Henao

0 answer

How to estimate variance of classifier on test set?

I have a binary classification task for which I want to compare two different classification methods as well as hyper-parameters for each.I have used k-fold cross-validation (k = 5)...

Asked on 02/15/2021 by pterojacktyl

2 answer

Churn prediction for customers with limited data

I am working on a churn prediction model. I eliminated customers with less than 5 orders. The model works fine for the customer having 5 or more orders but how...

Asked on 02/14/2021 by Ahmet Tuğrul Bayrak

0 answer

multiple linear regression vs polynomial regression models

I am working on a marketing budget plan, i used both multiple linear regression and polynomial regression models. I am not sure if i can compare them based on rse...

Asked on 02/14/2021 by Gracetam

0 answer

Multiple Regression study design - questionnaires

If an existing questionnaire does not exist to tap into a construct, is it better to change the instructions of a preexisting measure that isn't quite tapping into the variable...

Asked on 02/14/2021

1 answer

Which package works for mediation analysis in R when variables are categorical?

I am assessing pregnancy data where my exposure is categorical variable (either dichotomized or ordinal), potential mediator is categorical (dichotomized or ordinal) and the outcome is also categorical (yes/no). ...

Asked on 02/14/2021 by Fouzia Farooq

0 answer

Compare two samples with many zeros

We carried out a number of some experiments and got 10 independent 2-samples datasets. Is it possible to show a significant difference between the two samples, if each of them...

Asked on 02/14/2021

4 answer

Non-statistically significant effect of the instrument in the reduced form of the 2SLS

I am using a 2SLS, with two endogenous variables and two instruments.I conduct the Under- and the Weak-identification tests; results from these tests suggest that my instruments are not...

Asked on 02/14/2021 by Fuca26

1 answer

What are the different types of averages?

I know there are three types of averaging methods in statistics: Mean, Mode and Median. Are there any other type of averaging methods that...

Asked on 02/14/2021 by gpuguy

4 answer

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