# All Questions

30 views

### What is the duality relationship between eigensystems of X X' vs X' X?

I want to know the relationship between the eigensystems of two non-negative-definite (covariance-like) matrices. Both are derived from X which is a T-by-K real matrix (wlog say K > T). I avoid ...
9 views

### Filtering to avoid the Slutsky-Yule effect in a moving window average?

Can anyone suggest a generally accepted method of filtering time series data to avoid the appearance of artifactual oscillations when smoothing the data using a moving window average? Is it simply a ...
27 views

### Daily data, different dates

I have downloaded two different daily data sets, both for the same period. Together I want to use them to construct data for another variable. However, the problem is that the dates do not exactly ...
12 views

### How to Schedule R Activity [on hold]

I am having following requirement, 1. Run R regression techniques on mainframe Data 2. Do visualization and save it for business users My questions are, What is the best way to integrate R with ...
5 views

### Training an Elman Recurrent Neural Network?

I have few doubts related to training Elman RNN using Backpropagation Through Time Algorithm. Assume, I present a sequence to the network and the network adapts the parameters based on the error ...
21 views

### Metropolis : Set first sample value instead of randomly generate an arbitary value

According to Metropolis-Hasting algorithm, the first sample is an arbitrary value generated randomly at the Initialization step. ( http://en.wikipedia.org/wiki/Metropolis%E2%80%93Hastings_algorithm ) ...
19 views

### What are some standard bimodal distributions?

I have plotted this curve using the default kernel density estimate function in R I am looking for some standard distribution which could be close to this. Is there any standard bimodal distribution ...
8 views

### Does VECM use the stationary series or the originals ones?

I have some cointegrated series and I decided to build a VECM model. (I differentiated them twice in order to get stationary series and that led me to believe that they might be cointegrated - I ...
15 views

### What is the right way of computing baseline hazard rate

What is the right way of computing baseline hazard rate? To my understanding hazard rate at time t is simply #events / #AtRisk ...
28 views

14 views

### Johansen cointegration test: interpretation of results in EViews

I am not sure whether I am interpreting the cointegration test correctly. This is the test result: Because of the probability of the test I understand that my series are cointegrated of order 2. ...
40 views

### Understanding neural networks and classes

I want to know if this argumentation is valid or not of my algorithm. I'm trying to implement a CBIR (Content-Based Image Retrieval) where I've used the basics on CBIRs (colour, texture, shape, ...
42 views

### What makes the recommendation problem unable to be solved by traditional machine learning algorithms directly?

We have collaborative filtering and content based algorithms there for recommendation. What stops traditional algorithms from directly being used to find missing values in the Utility matrix ...
27 views

### Is continuous inputs an assumption of factor analysis?

Should we use only continuous inputs for factor analysis (FA)? My data is a mix of continuous and categorical inputs: one of the inputs has only 600, 700 and 1000 as values. I found that principal ...
12 views

### Lowering C parameter increases the number of support vectors

I know that the C (cost) parameter controls the trade-off between model complexity and misclassification. A large C should increase the error weight, and therefore the model complexity. Nevertheless, ...
26 views

### What are the formulae used in R by predict.lm when interval= a) 'none', b) 'prediction', and c) 'confidence'?

The references provided in the R documentation for predict.lm, taken together, actually leave open a number of possibilities for the formulae for confidence and prediction intervals (including the ...
21 views

### How do I calculate clustering of symptoms?

I am trying to assess whether a risk factor (A) has an impact on clustering of 3 types of symptoms (B, C, D). I know that A has a significant association with B, C, and D. So first I did a ...