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Cross Validated : Recent Questions and Answers (Page 49)

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

What has more statistical power when determining glm parameter importance, comparing models with a dropped parameter or coefficient pvalues?

I am looking to determine the significant of a parameter in a negative binomial distributed glm to determine if origin (either isolate or free) is important in the model:mnegbin1...

Asked on 11/02/2021 by Lamma

1 answer

How to get log odds from these results of logistic regression

I have performed logistic regression (using 'LOGIT') on variables from titanic dataset. The formula used is:survived ~ age + sex + pclassI have obtained results as...

Asked on 11/02/2021

1 answer

P-value correction for multiple testing using huge datasets

First of all I apologize without the question is very basic, I am taking my first steps in data science, statistics and bioinformatics.Data informationWe are evaluating the correlation (using the...

Asked on 11/02/2021

1 answer

longitudinal dataset with multiple binary dependent variables

I have a dataset where a test (a continuous variable) is administered every 3 months for 2 years for most of the participants (approx 25% have one or two missing...

Asked on 11/02/2021

1 answer

Online gradient descent for strongly convex function

Given that our loss function is $alpha$ strongly convex function which means $mbox(nabla f(mathbf{x})-nabla f(mathbf{y}))^{T}(mathbf{x}-mathbf{y})geq alpha||mathbf{x}-mathbf{y}||_{2}^{2} $ we know the Online gradient descent algorithm can get$Clog(T))/alpha$ for some...

Asked on 11/02/2021 by Raba Poco

1 answer

Is there a way to recover a temporal dependence structure in a time series from a regression against time?

Consider a time series: $X_1,X_2,...X_{n-1},X_n$ This series can also be written as a function of time $X(t)$, so that: $X_1,X_2,...X_{n-1},X_n = X(t_1),X(t_2),...X(t_{n-1}),X(t_n)$ Most forecasting methods, such...

Asked on 11/02/2021 by Skander H.

3 answer

Issues with posterior simulation from GAM

I'm trying to sample from the posterior distribution of a GAM fit with mgcv in R. While the model is fit with maximum likelihood, posteriors can be recovered. A good...

Asked on 11/02/2021 by Caseyy

1 answer

R: Mixed ANOVA works with the aov{stats} function and fails with the anova_test{rstatix} function. Why?

I can implement a rather complicated mixed ANOVA in R with the aov{stats} or the lmer{lme4} functions, but not with the anova_test{rstatix} nor the Anova{car} functions. My question follows: How...

Asked on 11/02/2021 by Joe Wright

1 answer

What are some non-toy applications of autoencoders?

I haven't come across a real world application of autoencoders before. Usually, for dimensionality reduction I've used PCA or random projections instead. Most examples I've come across of using autoencoders...

Asked on 11/02/2021 by dmh

4 answer

Change Score or Regressor Variable Method - Should I regress $Y_1$ over $X$ and $Y_0$ or $(Y_1-Y_0)$ over $X$

I have data about investment preferences 1 year before the Covid and during the Covid lockdown. Some changes appear using simple T-Test. I want to be able to assess if...

Asked on 11/02/2021 by L. M.

1 answer

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