# All Questions

27 views

### No regularisation term for bias unit in neural network

According to this tutorial on deep learning, weight decay (regularization) is not usually applied to the bias terms b why? What is significance (intuition) behind it?
8 views

### Model fit VS R-square in path analysis

This is more a conceptual problem, as path analysis (without latent variable) is basically regressions, can I say the model fit indices is something similar to the F value? Usually in regression, ...
14 views

### Don't know how to properly weight this calculation [on hold]

Seeking expert help. I have customer analysis problem I'm trying to solve. I have 4 segments of customers, which are: Segment A Segment B Segment C Segment D ...
25 views

### Recurrent vs Recursive Neural Networks: Which applies better for NLP?

So, we have Recurrent Neural Networks and Recursive Neural Networks. Both are usually denoted by the same acronym: RNN. According to Wikipedia, Recurrent NN are in fact Recursive NN, but I don't ...
14 views

### Difference between autocovariance and autocorrelation [on hold]

I read from a book when i read about Yule-Walker estimation that "autocorrelation has nicer properties than autocovariance".. can any one tell me why please
24 views

### How to find conditional distributions from joint

I want to learn about how to do Gibbs sampling, starting with finding conditional distributions given a joint distribution. While looking for examples, I found this blog post that I wanted to ...
15 views

### LOOCV vs. AIC for Weighted Multiple Regression Model Selection

I am currently trying to determine the most predictive weighted multiple linear regression model to use. I don't have much formal statistical training, so I would greatly appreciate any help with the ...
16 views

### For a one-tailed test using OLS regression in SPSS, is it appropriate to divide the change statistics p-values in half?

I am running a series of moderation regression models in SPSS and entering the models in using blocking (e.g., controls in block 1, controls and IVs in block 2, controls, IVs and moderator in block ...
26 views

### Is structural equation modeling (SEM) just another name of confirmatory factor analysis (CFA)?

I am reading some material about structural equation modeling. I found it to be extremely similar to confirmatory factor analysis - modeling a construct as the linear combination of several other ...
19 views

### Random slope and random intercept correlation at every level of X

Lets say individuals are nested within each ID and I am trying to a predict level 1 outcome Y from a level 1 predictor X1 or X2 with random slopes and intercepts. X1 and X2 are equivalent to each ...
14 views

### Estimating treatment effects on unequal groups

The setup is quasi-experimental: treatment and control groups, chosen ahead of time, are given a pre-test and a post-test. They are close to equal in size, and while membership was selected based on ...
6 views

### ANCOVA model with non-significant variables performs better?

I'm running an ANCOVA test with 2 dichotomus and 1 ordinal variable as fixed factors and 2 continuous variables as covariates. I was advised to remove any non significant factors because with them ...
14 views

### Need an effective way to show distribution changes over time and outlier reoccurence

Does anyone have suggestions on the best way to approach this problem? I have a large dataset (over 200k+ per day) in a MySQL database, that consists of a single record per user per day with a ...
12 views

### Class imbalance problem - Random under sampling

I have a class imbalance problem in my data set (99.5%,0.5%). I understand that there are various sophisticated ways to deal with this problem, but I am trying a fairly simple approach - Random under ...
22 views

### References for tiny sample statistics

There are multiple fascinating problems and approaches connected to really small samples. It is possible to estimate confidence intervals using a single point, or there are well known problems such as ...
35 views

### Recovering number of planets in a sample

I have a sample of $N$ stars (where $N \approx 5000$). Each star might host 0, 1 or more planets; each planet around star i has a probability $p_i$ of being detected (independent of whether or not any ...
15 views

### How to implement knn in r with missing values?

I have this data set from https://archive.ics.uci.edu/ml/machine-learning-databases/credit-screening/crx.names which gives a good summary of the attributes im using. Some of the observations are ...
7 views

16 views

### calling R2OpenBUGS with Wine on Mac [on hold]

I really don't know where to go for a solution to this problem. This may not be the right place... I also tried stackoverflow but got no response. Any suggestions gratefully received. I'm trying to ...
24 views

### How to determine if a categorical variable affects an independent variable?

I am looking at the wine dataset from the R FactoMineRpackage to find out whether the categorical variable soil type affects the ...
1k views

### Why are there two spellings of “heteroskedastic” or “heteroscedastic”?

I frequently see both the spellings "heteroskedastic" and "heteroscedastic", and similarly for "homoscedastic" and "homoskedastic". There seems to be no difference in meaning between the "c" and the ...