# All Questions

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### Graph node binary classification: Training set labels contain false negatives

I'm working on a graph node classification problem. Given a graph G = (V, E) where each vertex v has a set of features x, and each edge e may also have a set of features, I want to predict which (...
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### Can I use a frequency distribution to encode categorical variables in a neural network?

I would like to use categorical features to an autoencoder neural network. Typically for categorical features my approach has been to one-hot encode the features to make indicator features. The ...
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### What’s the relationship between the variables in $E[(Y-(b_0+b_1X))^2]$ and $\frac{1}{n}\sum_{i=1}^{n}(y_i-(b_0+b_i x_i))^2$ in linear regression?

From Section 1.2 and 1.3 of these notes, for some r.v. $X$ and $Y$, if $MSE(b_0, b_1) = E[(Y-(b_0+b_1X))^2]$, it was found that $\beta_1 = \frac{Cov[X,Y]}{Var[X]}$ and $\beta_0 = E[Y]-\beta_1E[X]$ are ...
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### Should I trust AIC value or the p-value of linear regression model?

I have a linear model and when i run the stepwise variable selection, i got: ...
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### ML model performs better on unseen data in comparison to performance on CV train — Is that a problem?

I am using Matlab to train a feedforward NN using Cross validation (CV) approach. My understanding of CV approach is the following. (Please correct me where wrong) Let ...
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### Multiple testings ANOVA

Please help me to explain Why are multiple testings an issue when conducting ANOVA type models such as Two Way ANOVA? Thank you.
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### Generalization of Bessel's correction to higher order models?

Multiplying sample variance (i.e. variance from sample mean) by $\frac{n}{n-1}$ to obtain an unbiased estimate of the population variance (i.e. variance from population mean) is called Bessel's ...
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### Type-III sums of squares F-test's

I would like to know the answer and explanation: True or False? The overall Type-III sums of squares F-test's allow the analyst to determine where specific differences lie between levels of the ...
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### Check when dataset should be splitted

I have a dataset where I need to say if it could be divided into two or more to help the AI to classify that dataframe. Therefore, I applied the elbow method and the silhouette to see into how many ...
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### Meta Analysis with Likelihood Ratios

I am currently writing a protocol for a systematic review and meta analysis to analyze the available evidence regarding epidemiologic studies on risk factors for pneumonia. The end goal of the ...
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### Web application with model results for use in healthcare?

Often in medicine we use scores, so the patient gets 1 point for this symptom, another for this etc. and a final a score determines their risk/treatment strategy. If we have reliable data and build a ...
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### How can I use R Studio to make a high dimensional X matrix of my predictor variables [closed]

I am working on a problem that has a sample size of 40, and 200 variables in my data set (Including my Y vector). I am just wondering how I can use R to make an X matrix using all my given columns, ...
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### I need help with my Epidemiology test problems [closed]

We got examples of test problems that are going to be on our exam so can anybody please help me with them. Thanks in advance This is a cohort study about the effect of high BMI on developmet of ...
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### Can I Use Lagged Indep Vars to See Endogeneity in 2SLS FE

Can I use lagged explanatory variables as instrument variables to figure out if the variable at question is endogenous when I use 2SLS FE estimation (in Stata: xtivreg2)?
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### Generate an Index in Stata [closed]

I want to create an Index (Average Air Pollution per Child) and have the following information (see picture) I need to calculate the average air pollution (given per year) for each child. An example:...