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Cross Validated : Recent Questions and Answers (Page 3)

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Making predictions manually from a mixed effects model

I have a mixed effects logistic regression model that is a bit more complicated than I've done in the past and just want to know if I'm thinking things correctly....

Asked on 01/05/2022 by aarsmith

1 answer

Is it necessary to scale the target value in addition to scaling features for regression analysis?

I'm building regression models. As a preprocessing step, I scale my feature values to have mean 0 and standard deviation 1. Is it necessary to normalize the target...

Asked on 01/03/2022 by user2806363

7 answer

Are Neural Nets a Special Case Of Graphical Models?

Are Deep Neural Nets Graphical Models? In the talk, here at NIPS, they say that:GANs and VAEs are Graphical Models, just with a particular CPD and cost...

Asked on 01/03/2022

2 answer

R Calculate sample weights based on two socio-demographic variables and aggregate results

After conducting a short survey, I have collected the results in the form of a dataframe. This is a reproducible version of what the actual data frame looks like.library(dplyr)library(tidyr)df=data.frame(ID=c("1101","1102","1103","1104",...

Asked on 01/03/2022

1 answer

What is the Cost Function for Neural Network with Dropout Regularisation?

For some context, I shall outline my current understanding: Considering a Neural Network, for a Binary Classification problem, the Cross-entropy cost function, J, is defined as: $ J =...

Asked on 01/03/2022

1 answer

At what point in analysis do you perform imputation for missing variables?

There is a dataset with 30 variables and over 5 million observations. We plan to use a subsample of the data for analysis. Around .02 - 2.5% of EACH variable...

Asked on 01/03/2022 by iPlexipen

2 answer

Possible reasons that validation recall is fluctuating across different epochs but the precision is stable?

I know this is not a coding question, but didn't have any idea where can I ask for help on this. I'm training a deep learning model. After each epoch...

Asked on 01/03/2022 by khemedi

0 answer

visualizing the scatterness of higher dimensional data using python

I have a set of unlabeled data $x in mathbb R^n$, and I want to visualize how scattered those points are using python. In dimension 2, we can just...

Asked on 01/03/2022

0 answer

Linking the orders of an ARMA and ARIMA representation of a unit root process

If $Delta Y_t$ can be described by a (stationary) $ARMA(p,q)$ process, then $Y_t$ can be described by an $ARIMA(p,1,q)$ process. Theoretically (concerns of usefulness aside), does...

Asked on 01/03/2022 by Indula

0 answer

Mixed Effects Model: Writing and Interpreting Models with Two and Three-Way Interaction Terms and No Random Intercept

Question: Have I correctly translated my lmer models into formulas depicting each individual level, as well as the composite formula? Specific questions about my work below.Information about my models...

Asked on 01/03/2022 by E. Wade

0 answer

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