All Questions

1answer
31 views

Implementing bayesian networks in python for gaze estimation using visual saliency

I am developing an appearance based gaze estimation system based on opencv and python. I have currently developed a prototype which can estimate the gaze based on active calibration, which is ...
0answers
8 views

How should I combine this binary scale with a 4-point scale?

I'm doing a meta-analysis and I want to combine the results of two questionnaires. One questionnaire has 30 questions about whether you've experienced certain traumatic life events. They're all ...
0answers
11 views

1answer
23 views

Time series analysis with known outliers

Let's say I have a time series of site usage data that I would like to analyze. The data is for people visiting my site, with a known seasonality that I can easily calculate, but in addition, there ...
0answers
10 views

Efficient Triangular Backsubstitution in R [migrated]

I am interested in solving the linear system of equations Ax=b where A is a lower-triangular matrix (n $\times$ n) and b is a (n $\times$ 1) vector where n $\approx$ 600k. I coded up backsubstitution ...
0answers
10 views

How to minimize setup cost in linear programming model using R [migrated]

Suppose we have a matrix m: > m C1 C2 M1 70 80 M2 50 61 M3 45 40 with machines M1-M3 and customers C1-C2. The values indicated the product volume that each ...
0answers
16 views

Maximum lag selection for panel unit root tests

I am interested in conducting panel unit root tests on a panel of subregional annual data where N>100 and T<10 (more specifically, depending on the independent variables included in each ...
2answers
23 views

Tests of heteroscedasticity in linear regression models

I am unfamiliar with the implementation used in the R package GVLMA. What are some basic tests of heteroscedasticity in linear regression models and how or where ...
0answers
6 views

How should I measure difference between user behavior / model performance on different population?

I am developing a recommendation engine whose goal is to suggest data exploration routes to non-technical users. The underlying model is content based, with the training data made up of the behavior ...
0answers
10 views

Likert scale dependent variables

I am doing a research about the ethics in pharmaceutical industry. I've chosen 7 branding activities followed by pharmaceutical companies. I want to study the relationship between the perception of ...
0answers
12 views

Detecting linear connection between only several measurements in PCA (or any orther method)

$X$ is an $n\times p$ data matrix that has $n-d$ random measurements and $d$ highly correlated measurements, i.e. $X_{n-d+1+i}=b_i+a_iX_{n-d+1}+W_n$ for $i=1,2,...,d-1$, $a_i,b_i$ are unknown ...
0answers
18 views

How is the entropy calculated by the entropy package in R?

So, as per the docs, I'm calling the function like this v = c(0,4,3,6,7,3,2,3,4,5) entropy(discretize(v, numBins = 8, r = c(0,7))) and I get ...
0answers
11 views

How to make a 4X6 matrix from a 6X6 diagonal matrix in MATLAB [on hold]

I am having a diagonal matrix A = diag(a,b,c,d,e,f) which is a 6X6 matrix. From this I want to make 4X6 matrix specified by: B(1, :) = [a b 0 0 0 0] B(2, :) = [0 0 c 0 0 0] B(3, :) = [0 0 0 d e 0] ...
2answers
19 views

Test Control. A longitudinal study

I have two samples of the same size, one being the 'treated' group, and the other used as a 'control' group. Each group have a different univariate variable (stress level), repeatedly observed over ...
0answers
6 views

Longitudinal data with different response measurement types

I intend to fit a generalized linear (possibly mixed) model to longitudinal count data. However, I am running into an issue. The response I am modeling is a measure of student activity involvement. At ...
0answers
6 views

Convert coordinates to neighbor list for spatial analysis in R using INLA [on hold]

I am trying to do an analysis of two greyscale images taken a few seconds apart, where each pixel in the first image should be predictive of the pixel in the second image. In general pixels near each ...

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